Module 3-Lecture 14

Question 1

Migration

Answer 1

Homogenizes different populations
-introduces new alleles and haplotypes
-CAN change haplotype and allele frequencies

Question 2

Recombination

Answer 2

-Reshuffles alleles
-creates new haplotypes
-does NOT change allele frequencies
-can increase/decrease genetic diversity

Question 3

Can recombination change allele frequencies

Answer 3

-does NOT change allele frequencies
-changes haplotype frequencies

Question 4

Mutation

Answer 4

-spontaneous random heritable changes
-introduces new alleles and haplotypes
-INCREASES genetic diversity
-can change allele and haplotype frequencies

Question 5

Genetic drift

Answer 5

-random changes in allele and haplotype frequencies
-REDUCES genetic diversity

Question 6

Natural Selection

Answer 6

-INCREASES frequencies of fitter alleles and haplotypes
-REDUCES genetic diversity

Question 7

True or false: Mutation and genetic drift can be fully eliminated

Answer 7

False
-Mutation and genetic drift can NEVER be fully eliminated

Question 8

What are the necessary ingredients/postulates for natural selection?

Answer 8

1. There is genetic diversity in the population
2. Some genetic variants are more fit than others

Question 9

True or false: Competition for finite resources is required for natural selection to work

Answer 9

False
-it is always there, but NOT required for natural selection to work

Question 10

What is fitness?

Answer 10

Number of offspring that an individual produces per unit of time