Lecture 10: Finite population size (Exam 2)

Question 1

what is genetic drift?

Answer 1

• changes in allele frequencies only due to statistical sampling errors
• random and not adaptive

Question 2

How and when does genetic drift affect populations

Answer 2

alelle frequencies in populations change simply because of sampling errors

Question 3

What is genetic drift’s relationship with population size

Answer 3

as population size decreases, the effect of sampling errors increases; **inverse relationship **

Question 4

what effects does genetic drift produce and what are some consequences of those effects

Answer 4

• it produces strong effect in small populations
• the consequences are ?

Question 5

how can genetic drift interact with natural selection

Answer 5

ask in office hours

Question 6

major differences between genetic drift and natural selection

Answer 6

• genetic drift is random and not based on adaptation, while natural selection is not random, and is based on adapatation

Question 7

Be able to interpret the allele frequency graphs we discussed in class

Answer 7

……..

Question 8

fixed allele

Answer 8

frequency = 1, so the allele is fixed

Question 9

lost alelle

Answer 9

frequency is 0; ex q = 0

Question 10

polymorphic

Answer 10

more than one allele occupies that gene’s locus within a population

Question 11

bottleneck

Answer 11

large portion of a population is lost

Question 12

founder effect

Answer 12

small number individuals colonize a new area