1 / 15

Mechanisms of E v o l u t i o n

Mechanisms of E v o l u t i o n. All the genes present in a population. Gene Pool. Genetic Drift. Evolution occurring through random changes in allele frequency over time. . Genetic Drift. Creation of gametes is randomized Some alleles are passed on more than others by chance.

kendall
Download Presentation

Mechanisms of E v o l u t i o n

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mechanisms ofEvolution

  2. All the genes present in a population Gene Pool

  3. Genetic Drift • Evolution occurring through random changes in allele frequency over time.

  4. Genetic Drift • Creation of gametes is randomized • Some alleles are passed on more than others by chance

  5. http://www.biology.arizona.edu/evolution/act/drift/frame.htmlhttp://www.biology.arizona.edu/evolution/act/drift/frame.html

  6. Gene drift is more noticeable in smaller populations. Why?

  7. Types of Genetic Drift • Founder Effect: occurs when a small group of individuals colonize a new habitat • allele frequency changes as a result of the migration of a small subgroup

  8. Types of Genetic Drift • Bottleneck effect: a significant percent of the population is killed or cannot reproduce • Natural disaster • Habitat destruction • Hunting

  9. Bottleneck Effect

  10. Gene Flow • Movement of genes from one population to another

  11. Divergent Evolution • Differences between groups can lead to the formation of new species • different groups adapt to different environments • Remember homologous structures

  12. Ancestral Cat

  13. Convergent Evolution • Different organisms living in similar environments can evolve similar traits • Convergent Evolution: the process by which unrelated organisms come to resemble each other • Remember analogous structures! • Shark and dolphin

More Related