Fossils provide a record of evolution Paleontology is the study of fossils or extinct organisms Paleontology provides evidence to support evolution Molecular and genetic evidence support fossil and anatomical evidence ID: 1046843
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1. KEY CONCEPT New technology is furthering our understanding of evolution.
2. Fossils provide a record of evolution. Paleontology is the study of fossils or extinct organisms.
3. Paleontology provides evidence to support evolution.
4. Molecular and genetic evidence support fossil and anatomical evidence. Two closely-related organisms will have similar DNA sequences.
5. Pseudogenes are sequences providing evidence of evolution.no longer functioncarried along with functional DNAcan be clues to a common ancestor
6. Hox genes indicate a very distant common ancestor.control the development of specific structuresfound in many organismsProtein comparisons, or molecular fingerprinting reveals similarities among cell types of different organisms.
7. Scientist from any fields contribute to the understanding of evolution.The basic principles of evolution are used in many scientific fields.Evolution unites all fields of biology.
8. KEY CONCEPT A population shares a common gene pool.
9. Genetic variation in a population increases the chance that some individuals will survive.Genetic variation leads to phenotypic variation.Phenotypic variation is necessary for natural selection.Genetic variation is stored in a population’s gene pool.made up of all alleles in a populationallele combinations form when organisms have offspring
10. Allele frequencies measure genetic variation.measures how common allele is in populationcan be calculated for each allele in gene pool
11. Genetic variation comes from several sources.Mutation is a random change in the DNA of a gene.Recombination forms new combinations of alleles. can form new allele can be passed on to offspring if in reproductive cells usually occurs during meiosis parents’ alleles arranged in new ways in gametes
12. Genetic variation comes from several sources.Hybridization is the crossing of two different species.occurs when individuals can’t find mate of own speciestopic of current scientific researchZeedonk Prizzly
13. Gene flow is the movement of alleles between populations. Gene flow occurs when individuals join new populations and reproduce.Gene flow keeps neighboring populations similar.Low gene flow increases the chance that two populations will evolve into different species.bald eagle migration
14. Genetic drift is a change in allele frequencies due to chance. Genetic drift causes a loss of genetic diversity.It is most common in small populations.A population bottleneck can lead to genetic drift. It occurs when an eventdrastically reducespopulation size.The bottleneck effect isgenetic drift that occursafter a bottleneck event.
15. The founding of a small population can lead to genetic drift.It occurs when a few individuals start a new population.The founder effect is genetic drift that occurs after start of new population.
16. Genetic drift has negative effects on a population.less likely to have some individuals that can adapt harmful alleles can become more common due to chance
17. Sexual selection occurs when certain traits increase mating success. Sexual selection occurs due to higher cost of reproduction for females.males produce many sperm continuouslyfemales are more limited in potential offspring each cycle
18. There are two types of sexual selection.intrasexual selection: competition among malesintersexual selection: males display certain traits to females