Lecture 18.docx

3 views2 pages
18 Apr 2012
School
Department
Course
Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Lecture 18
Geographic variability of variation
People
Fisher: evolution occurs in large populations by natural selection
Wright: important role for population structure and genetic drift (stochastic) play
big role in evolution
Both are right to some extent. Genetic drift doesn’t completely drive genetic drift, it
still does something though
California picture:
North hillside- microenvironments different. Effects animals there
South hillside-
Boundaries are discreet.
Definitions:
Population- a group of individuals of one species in one area at one time
Migration- movement of individual from one pop to another
Gene flow- the movement of genes from one pop to another
Asymmetric gene flow- gene flow in one direction
Hybridization-
Transgenes- engineered genes
Geographical differntiation
How do species differ genetically
Not all genes are equally spread
How much gene differentiation adaptive
Genetic variability is within population, not outside
Force that make population genetically different
1) natural selection.
2) genetic drift
Preventaive forces opposing forces above
- gene flow
Measuring gene flow
-is it migration vs gene flow
- is it individuals or gamets moving
*experiments needed*
Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class