eyes what frequency of the population is hybrid for brown eyes Homozygous for brown eyes 2 How does sexual reproduction produce variation 3 Why are pointsubstitution mutations also known as silent mutations ID: 583276
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1. If 1/350 people have blue eyes, what frequency of the population is hybrid for brown eyes? Homozygous for brown eyes?2. How does sexual reproduction produce variation?3. Why are point/substitution mutations also known as silent mutations?
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1. If 1/350 people have blue eyes, what frequency of the population is hybrid for brown eyes? Homozygous for brown eyes?2. How does sexual reproduction produce variation?A population contains a vast number of gene combinations. Sexual reproduction reshuffles alleles into fresh combinations.
3. Why are point/substitution mutations also known as silent mutations?
These mutations may not change the amino acid and the protein so the mutation have not effect!
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Pg. 33 Variation Slide3
John Ehret Patriots Bring the `Pain Spirit Day Extra CreditQuiz #7:Average: 1.72Top Score: Travia
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Pg. 33 VariationSlide4
Daily Catalyst Class BusinessHardy-Weinberg problemVariation notes Debate PrepHomework: 137-14210/14 Agenda Pg. 33 VariationSlide5
There are 100 students in a class. Ninety-six did well in the course whereas four blew it totally and received a grade of F. Sorry. In the highly unlikely event that these traits are genetic rather than environmental, if these traits involve dominant and recessive alleles, and if the four (4%) represent the frequency of the homozygous recessive condition, please calculate the following: A. The frequency of the recessive allele. B. The frequency of the dominant allele. C. The frequency of heterozygous individuals. Hardy Weinberg EquilibriumSlide6
Of all the mutations that occur, why do only a small fraction become widespread in a gene pool?Most mutations occur in somatic cells that do not produce gametes and are lost when the organisms die. Of the mutations that occur in the gametes, most do not have an effect on phenotypes and natural selection will not act on it. If you do have a harmful mutation, most will not survive to reproduce. Essay PromptSlide7
1. Mutations2. Sexual Recombination3. Genetic Drift4. Genetic Flow5. Natural SelectionCauses of EvolutionSlide8
Unpredictable changes in allele frequencies from one generations because of a populations finite sizeReduces genetic variationGenetic Drift:Slide9
A reduction of a population, typically after a disturbance, such that the survivors no longer represent the original populationExample?Bottleneck DriftSlide10
A small isolated group that may establish a new population.Represent a distinct gene pool from the parent gene poolExample?? (page 462)Founder EffectSlide11
Gene Flow:
Genetic additions and/or subtractions from a population resulting from the movement of individuals.
How has this been important to humans?Slide12
Key Point #1:Natural Selection accumulates and maintains favorable genotypes in a population. WE NEED GENETIC VARIATION!Genetic VariationSlide13
Variation in Variation (get it??)Slide14
Key Point #2:Polymorphism: Two or more distinct morphs represented in high amountsMorphs: different forms of a characteristicExamples of variationSlide15
Kordell mentioned yesterday, that he has noticed that in different geographical locations, he has seen traits that are more common in areas and not as common in other. Examples of VariationSlide16
Key Point #3:Geographic variation: Differences between gene pools of separate populationsExamples of VariationSlide17
Cline: page 464Slide18
Directional (pg. 465)Stabilizing (pg. 466)Disruptive (pg. 466)Natural Selection Slide19
Directional SelectionSlide20
Stabilizing SelectionSlide21
Disruptive SelectionSlide22
Pg. 466Heterozygote Advantage: