{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}


Lecture12_MigrationInbreeding - Gene flow and non-random...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Gene flow and non-random mating I. Gene flow (migration) as an evolutionary force A. Theory: the one-island model One-way movement of individuals (and alleles) from a large population on a continent to a Suppose that allele A 1 is at frequency on the island and that there are breeding individuals Suppose that allele A 2 is at frequency on the continent If individuals move from the continent to the island and begin to breed, the frequencies of the alleles in the island population are now: freq ( A 1 ): freq ( A 2 ): Upshot: B. What are the evolutionary consequences of gene flow? 1. Gene flow reduces differences between populations 2. May introduce new alleles; these may be II. Inbreeding as a form of non-random mating Inbreeding = mating among relatives A. When does inbreeding occur? 1. plant: 2. humans: 3. small populations B. What is the effect of inbreeding? Increases homozygosity =
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
A 1 A 1 A 1 A 2 A 2 A 2 NOTE: inbreeding does not change Therefore, inbreeding does not C. What is inbreeding depression?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}