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Boundless Lecture Slides - PPT Presentation

Free to share print make copies and changes Get yours at wwwboundlesscom Available on the Boundless Teaching Platform Using Boundless Presentations The Appendix The appendix is for you to use to add depth and breadth to your lectures You can simply drag and drop slides from the appendix ID: 778722

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Slide1

Boundless Lecture Slides

Free to share, print, make copies and changes. Get yours at

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Available on the Boundless Teaching Platform

Slide2

Using Boundless Presentations

The Appendix

The appendix is for you to use to add depth and breadth to your lectures. You can simply drag and drop slides from the appendix into the main presentation to make for a richer lecture experience.

Free to edit, share, and copy

Feel free to edit, share, and make as many copies of the Boundless presentations as you like. We encourage you to take these presentations and make them your own.

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Boundless Teaching Platform

Boundless empowers educators to engage their students with affordable, customizable textbooks and intuitive teaching tools. The free Boundless Teaching Platform gives educators the ability to customize textbooks in more than 20 subjects that align to hundreds of popular titles. Get started by using high quality Boundless books, or make switching to our platform easier by building from Boundless content pre-organized to match the assigned textbook. This platform gives educators the tools they need to assign readings and assessments, monitor student activity, and lead their classes with pre-made teaching resources.

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Slide3

Boundless is an innovative technology company making education more affordable and accessible for students everywhere. The company creates the world’s best open educational content in 20+ subjects that align to more than 1,000 popular college textbooks. Boundless integrates learning technology into all its premium books to help students study more efficiently at a fraction of the cost of traditional textbooks. The company also empowers educators to engage their students more effectively through customizable books and intuitive teaching tools as part of the Boundless Teaching Platform. More than 2 million learners access Boundless free and premium content each month across the company’s wide distribution platforms, including its website,

iOS

apps, Kindle books, and iBooks. To get started learning or teaching with Boundless, visit boundless.com.

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About Boundless

Slide4

]

The Evolution of Populations

The Evolution of Populations

Population Evolution

Population Genetics

Adaptive Evolution

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Slide5

Defining Population Evolution

Population Genetics

Hardy-Weinberg Principle of Equilibrium Population Evolution

The Evolution of Populations

>

Population Evolution

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Slide6

Genetic Variation

Genetic Drift

Gene Flow and Mutation Nonrandom Mating and Environmental Variance Population Genetics

The Evolution of Populations

>

Population Genetics

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Slide7

Natural Selection and Adaptive Evolution

Stabilizing, Directional, and Diversifying Selection

Frequency-Dependent Selection Sexual Selection No Perfect Organism

Adaptive Evolution

The Evolution of Populations

>

Adaptive Evolution

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Slide8

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Appendix

Slide9

Key terms

allele one of a number of alternative forms of the same gene occupying a given position on a chromosomeassortative mating

between males and females of a species, the mutual attraction or selection, for reproductive purposes, of individuals with similar characteristicscline a gradation in a character or phenotype within a species or other groupcrossing over the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes

Darwinian fitness the average contribution to the gene pool of the next generation that is made by an average individual of the specified genotype or phenotypedirectional selection a mode of natural selection in which a single phenotype is favored, causing the allele frequency to continuously shift in one directiondisruptive selection (or diversifying selection) a mode of natural selection in which extreme values for a trait are favored over intermediate valuesfecundity

number, rate, or capacity of offspring productionfitness an individual's ability to propagate its genesfounder effect

a decrease in genetic variation that occurs when an entire population descends from a small number of foundersfounder effect a decrease in genetic variation that occurs when an entire population descends from a small number of founders

frequency-dependent selection the term given to an evolutionary process where the fitness of a phenotype is dependent on its frequency relative to other phenotypes in a given population

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The Evolution of Populations

Slide10

gene flow

the transfer of alleles or genes from one population to anothergene flow the transfer of alleles or genes from one population to anothergene pool

the complete set of unique alleles that would be found by inspecting the genetic material of every living member of a species or populationgenetic diversity the level of biodiversity, refers to the total number of genetic characteristics in the genetic makeup of a speciesgenetic drift an overall shift of allele distribution in an isolated population, due to random sampling

genetic drift an overall shift of allele distribution in an isolated population, due to random fluctuations in the frequencies of individual alleles of the genesgenetic hitchhiking a phenomenon in which a gene increases in a population because it lies near genes on the same chromosome that are advantageous to an organismgenetic hitchhiking changes in the frequency of an allele because of linkage with a positively or negatively selected allele at another locusgenetic variation

variation in alleles of genes that occurs both within and among populationsgenotype the combination of alleles, situated on corresponding chromosomes, that determines a specific trait of an individual, such as "Aa" or "aa"

handicap principle a theory that suggests that animals of greater biological fitness signal this status through a behavior or morphology that effectively lowers their chances of survivallinkage disequilibrium

a non-random association of two or more alleles at two or more loci; normally caused by an interaction between genes

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The Evolution of Populations

Slide11

mutation

any heritable change of the base-pair sequence of genetic materialmutation any heritable change of the base-pair sequence of genetic materialnatural selection

a process in which individual organisms or phenotypes that possess favorable traits are more likely to survive and reproducenatural selection a process in which individual organisms or phenotypes that possess favorable traits are more likely to survive and reproducephenotype the appearance of an organism based on a multifactorial combination of genetic traits and environmental factors, especially used in pedigrees

phenotypic variation variation (due to underlying heritable genetic variation); a fundamental prerequisite for evolution by natural selectionpolygynous having more than one female as matepolymorphism the regular existence of two or more different genotypes within a given species or populationrandom sampling a subset of individuals (a sample) chosen from a larger set (a population) by chance

sexual dimorphism a physical difference between male and female individuals of the same speciessexual selection

a type of natural selection, where members of the sexes acquire distinct forms because members choose mates with particular features or because competition for mates with certain traits succeedsexual selection a mode of natural selection in which some individuals out-reproduce others of a population because they are better at securing mates

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The Evolution of Populations

Slide12

stabilizing selection

a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value

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The Evolution of Populations

Slide13

ABO blood type in humans

In humans, each blood type corresponds to a combination of two alleles, which represent a the type of antigens displayed on the outside of a red blood cell. Human blood types are A, B, AB, and O.

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The Evolution of Populations

Slide14

The Founder Effect

The founder effect occurs when a portion of the population (i.e. "founders") separates from the old population to start a new population with different allele frequencies.

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The Evolution of Populations

Slide15

Adaptive evolution in finches

Through natural selection, a population of finches evolved into three separate species by adapting to several difference selection pressures. Each of the three modern finches has a beak adapted to its life history and diet.

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The Evolution of Populations

Slide16

Micrurus fulvius, the eastern coral snake

The eastern coral snake is poisonous.

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The Evolution of Populations

Slide17

The Hardy-Weinberg Principle

When populations are in the Hardy-Weinberg equilibrium, the allelic frequency is stable from generation to generation and the distribution of alleles can be determined.If the allelic frequency measured in the field differs from the predicted value, scientists can make inferences about what evolutionary forces are at play.

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The Evolution of Populations

Slide18

Evolution on earth

Evolution has resulted in living things that may be single-celled or complex, multicellular organisms. They may be plants, animals, fungi, bacteria, or archaea. This diversity results from evolution.

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The Evolution of Populations

Slide19

Effect of genetic drift

Genetic drift in a population can lead to the elimination of an allele from that population by chance. In this example, the brown coat color allele (B) is dominant over the white coat color allele (b). In the first generation, the two alleles occur with equal frequency in the population, resulting in p and q values of .5. Only half of the individuals reproduce, resulting in a second generation with p and q values of .7 and .3, respectively. Only two individuals in the second generation reproduce and, by chance, these individuals are homozygous dominant for brown coat color. As a result, in the third generation the recessive b allele is lost.

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The Evolution of Populations

Slide20

Temperature-dependent sex determination

The sex of the American alligator (Alligator mississippiensis) is determined by the temperature at which the eggs are incubated. Eggs incubated at 30 degrees C produce females, and eggs incubated at 33 degrees C produce males.

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The Evolution of Populations

Slide21

Sexual dimorphism

Morphological differences between males and females of the same species is known as sexual dimorphism.These differences can be observed in (a) peacocks and peahens, (b) Argiope appensa spiders (the female spider is the large one), and (c) wood ducks.

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The Evolution of Populations

Slide22

Mutation and natural selection

As mutations create variation, natural selection affects the frequency of that trait in a population. Mutations that confer a benefit (such as running faster or digesting food more efficiently) can help that organism survive and reproduce, carrying the mutation to the next generation.

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Wikipedia.

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The Evolution of Populations

Slide23

Genetic drift and gene fixation

In this simulation, there is fixation in the blue gene variation within five generations. Images these dots are beetles and some of them are destroyed by a wildfire. As the surviving population changes over time, some traits (red) may be completely eliminated from the population, leaving only the beetles with other traits (blue).

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Wikipedia.

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The Evolution of Populations

Slide24

Genetic drift over time

Ten simulations of random genetic drift of a single given allele with an initial frequency distribution 0.5 measured over the course of 50 generations, repeated in three reproductively synchronous populations of different sizes. In these simulations, alleles drift to loss or fixation (frequency of 0.0 or 1.0) only in the smallest population.Effect of population size on genetic drift: Ten simulations each of random change in the frequency distribution of a single hypothetical allele over 50 generations for different sized populations; first population size n=20, second population n=200, and third population n=2000.

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The Evolution of Populations

Slide25

Geographic variation in moose

This graph shows geographical variation in moose; body mass increase positively with latitude. Bergmann's Rule is an ecologic principle which states that as latitude increases the body mass of a particular species increases. The data are taken from a Swedish study investigating the size of moose as latitude increases as shows the positive relationship between the two, supporting Bergmann's Rule.

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The Evolution of Populations

Slide26

Polymorphism in the grove snail

Color and pattern morphs of the grove snail, Cepaea nemoralis.The polymorphism, when two or more different genotypes exist within a given species, in grove snails seems to have several causes, including predation by thrushes.

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The Evolution of Populations

Slide27

Hardy-Weinberg proportions for two alleles

The horizontal axis shows the two allele frequencies p and q and the vertical axis shows the expected genotype frequencies.Each line shows one of the three possible genotypes.

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The Evolution of Populations

Slide28

The Founder Effect

Here are three possible outcomes of the founder effect, each with gene pools separate from the original populations.

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The Evolution of Populations

Slide29

Mutation in a garden rose

A mutation has caused this garden moss rose to produce flowers of different colors. This mutation has introduce a new allele into the population that increases genetic variation and may be passed on to the next generation.

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The Evolution of Populations

Slide30

Galápagos with David Attenborough

Two hundred years after Charles Darwin set foot on the shores of the Galápagos Islands, David Attenborough travels to this wild and mysterious archipelago. Amongst the flora and fauna of these enchanted volcanic islands, Darwin formulated his groundbreaking theories on evolution. Journey with Attenborough to explore how life on the islands has continued to evolve in biological isolation, and how the ever-changing volcanic landscape has given birth to species and sub-species that exist nowhere else in the world.

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The Evolution of Populations

Slide31

Assortative mating in the American Robin

The American Robin may practice assortative mating on plumage color, a melanin based trait, and mate with other robins who have the most similar shade of color. However, there may also be some sexual selection for more vibrant plumage which indicates health and reproductive performance.

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The Evolution of Populations

Slide32

Effect of a bottleneck on a population

A chance event or catastrophe can reduce the genetic variability within a population.

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The Evolution of Populations

Slide33

Frequency-dependent selection in side-blotched lizards

A yellow-throated side-blotched lizard is smaller than either the blue-throated or orange-throated males and appears a bit like the females of the species, allowing it to sneak copulations. Frequency-dependent selection allows for both common and rare phenotypes of the population to appear in a frequency-aided cycle.

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The Evolution of Populations

Slide34

Lampropeltis elapsoides, the scarlet kingsnake

The scarlet kingsnake mimics the coloration of the poisonous eastern coral snake. Positive frequency-dependent selection reinforces the common phenotype because predators avoid the distinct coloration.

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The Evolution of Populations

Slide35

Diversifying (or disruptive) selection

Diversifying selection occurs when extreme values for a trait are favored over the intermediate values.This type of selection often drives speciation.

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The Evolution of Populations

Slide36

Sexual selection in elk

This male elk has large antlers to compete with rival males for available females (intrasexual competition).Tn addition, the many points on his antlers represent health and longevity, and therefore he may be more desirable to females (intersexual selection).

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The Evolution of Populations

Slide37

A male bird of paradise

This male bird of paradise carries an extremely long tail as the result of sexual selection.The tail is flamboyant and detrimental to the bird's own survival, but it increases his reproductive success.This may be an example of the handicap principle.

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The Evolution of Populations

Slide38

BBC Planet Earth - Birds of Paradise mating dance

Extraordinary Courtship displays from these weird and wonderful creatures. From episode 1 "Pole to Pole". This is an example of the extreme behaviors that arise from intense sexual selection pressure.

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The Evolution of Populations

Slide39

Gene flow

Gene flow can occur when an individual travels from one geographic location to another.

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The Evolution of Populations

Slide40

Low genetic diversity in the wild cheetah population

Populations of wild cheetahs have very low genetic variation. Because wild cheetahs are threatened, their species has a very low genetic diversity. This low genetic diversity means they are often susceptible to disease and often pass on lethal recessive mutations; only about 5% of cheetahs survive to adulthood.

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The Evolution of Populations

Slide41

Genetic variation in the shells of Donax variabilis

An enormous amount of phenotypic variation exists in the shells of Donax varabilis, otherwise known as the coquina mollusc. This phenotypic variation is due at least partly to genetic variation within the coquina population.

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The Evolution of Populations

Slide42

The Evolution of the Peppered Moth

Typica and carbonaria morphs resting on the same tree.The light-colored typica (below the bark's scar) is nearly invisible on this pollution-free tree, camouflaging it from predators.

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The Evolution of Populations

Slide43

Directional selection

Directional selection occurs when a single phenotype is favored, causing the allele frequency to continuously shift in one direction.

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Slide44

Stabilizing selection

Stabilizing selection occurs when the population stabilizes on a particular trait value and genetic diversity decreases.

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Slide45

Types of natural selection

Different types of natural selection can impact the distribution of phenotypes within a population.In (a) stabilizing selection, an average phenotype is favored.In (b) directional selection, a change in the environment shifts the spectrum of phenotypes observed.In (c) diversifying selection, two or more extreme phenotypes are selected for, while the average phenotype is selected against.

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The Evolution of Populations

Slide46

Attribution

Wiktionary.

"natural selection." CC BY-SA 3.0 http://en.wiktionary.org/wiki/natural_selection

Wiktionary. "genetic drift." CC BY-SA 3.0 http://en.wiktionary.org/wiki/genetic_drift

Wikipedia.

"Natural Selection." CC BY-SA 3.0

http://en.wikipedia.org/wiki/Natural_selection

Boundless Learning. "Boundless." CC BY-SA 3.0

http://www.boundless.com//biology/definition/genetic-hitchhiking

Wikipedia.

"gene flow."

CC BY-SA 3.0

http://en.wikipedia.org/wiki/gene%20flow

Wiktionary.

"mutation." CC BY-SA 3.0 http://en.wiktionary.org/wiki/mutationWikipedia.

"fitness." CC BY-SA 3.0

http://en.wikipedia.org/wiki/fitnessWikipedia.

"Evolution." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Evolution%23Mechanisms

OpenStax CNX. "OpenStax College, Biology. October 16, 2013." CC BY 3.0

http://cnx.org/content/m44575/latest/?collection=col11448/latestWiktionary. "founder effect." CC BY-SA 3.0 http://en.wiktionary.org/wiki/founder_effect

Wiktionary. "gene pool." CC BY-SA 3.0

http://en.wiktionary.org/wiki/gene_pool

Wikpedia.

"Population Genetics."

CC BY-SA 3.0

http://en.wikipedia.org/wiki/Population_genetics

Wiktionary.

"allele."

CC BY-SA 3.0

http://en.wiktionary.org/wiki/allele

OpenStax CNX.

"OpenStax College, Biology. October 16, 2013."

CC BY 3.0

http://cnx.org/content/m44582/latest/?collection=col11448/latest

Wiktionary.

"phenotype."

CC BY-SA 3.0

http://en.wiktionary.org/wiki/phenotype

Wiktionary.

"genotype."

CC BY-SA 3.0

http://en.wiktionary.org/wiki/genotype

OpenStax CNX.

"OpenStax College, Biology. October 16, 2013."

CC BY 3.0

http://cnx.org/content/m44582/latest/?collection=col11448/latest

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The Evolution of Populations

Slide47

Wiktionary.

"genetic drift."

CC BY-SA 3.0 http://en.wiktionary.org/wiki/genetic_drift

Wiktionary. "founder effect." CC BY-SA 3.0 http://en.wiktionary.org/wiki/founder_effect

Wikipedia.

"Genetic Drift." CC BY-SA 3.0

http://en.wikipedia.org/wiki/Genetic_driftOpenStax CNX.

"OpenStax College, Biology. October 16, 2013." CC BY 3.0 http://cnx.org/content/m44584/latest/?collection=col11448/latest

Wiktionary.

"mutation."

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http://cnx.org/content/m44584/latest/?collection=col11448/latestOpenStax CNX. "OpenStax College, Biology. October 16, 2013."

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Wiktionary. "assortative mating." CC BY-SA 3.0 http://en.wiktionary.org/wiki/assortative_mating

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Wiktionary.

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Wikipedia.

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Wiktionary.

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The Evolution of Populations

Slide48

Wikipedia.

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The Evolution of Populations

Slide49

Wikipedia.

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The Evolution of Populations