BIOL 290 Lecture Notes - Lecture 7: Genetic Drift, Allele Frequency, Allele

11 views3 pages
8 Oct 2018
Department
Course
Non-selective causes of Evolution
Thursday, October 4, 2018
4:01 PM
Founder Effect
Interbreeding
Mutations
Genetic Drift
o Genetic drift, founder effect, and interbreeding
most important in small populations
1. Founder Effect:
Individuals who leave a larger population and move to
a new habitat; founders of the new population that
will grow
Allele frequencies in the new population are most
likely due to sampling
o Bottleneck effect: reducing a population to a few
members; can eliminate genetic diversity
Ex: Northern elephant seals; 20 remained; (40
alleles) now 175,000 vs Southern elephant seals
who did not face an extinction crisis; have much
more diversity in their population
French Canadians: 8,500 French Settlers
colonized the province between 1608-1759
o Consequences:
Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
Monthly
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.