1 / 12

Population Genetics and evolution

Population Genetics and evolution. Population Genetics and microevolution. Darwin developed his theory of _____________ evolve , not ______________ An organism is born with Evolution occurs as a Gene Pool : Allelic Frequency :

mio
Download Presentation

Population Genetics and evolution

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. Population Genetics and evolution

  2. Population Genetics and microevolution • Darwin developed his theory of • _____________evolve, not ______________ • An organism is born with • Evolution occurs as a • Gene Pool: • Allelic Frequency: • A population of organisms in which the allelic frequency remains the same over generations is said to have reached _______________________________

  3. Changes in Genetic Equlibrium • Mutations • . • most • some may • Genetic Drift • change in • affects • is responsible for • Movement of individuals

  4. Genetic Drift and Allelic Frequency

  5. Natural Selection acts on variations • Stabilizing Selection • favors • reduces • Directional Selection • nature • ex: • Disruptive Selection • nature favors • complete opposite of

  6. Evolution of Species (macroevolution) • Speciation: evolution of • Can be caused by: • Geographic Isolation • when a • over time, • Reproductive Isolation (two types) • genetic material • behavioral changes • Change in Chromosomal Number • caused by • polyploid: • results in immediate

  7. Geographic Isolation

  8. How quickly does speciation occur? • 2 Views • Gradualism: • Punctuated Equilibrium: • Biologists tend to agree that both occur depending on the circumstances

  9. Gradualism vs. punctuated equlibrium

  10. Patterns of Evolution • Divergent Evolution • Pattern of evolution • Occurs when Convergent Evolution • Pattern of evolution • Occurs due to • Ex: dolphins and sharks or euphorbs and cacti

More Related