Lecture 8

Question 1

Genetic Drift

Answer 1

Stochastic changes in allele frequency due to random variaiton in fecundity and mortality

Question 2

Gene Flow

Answer 2

Movement of alleles from one population to another due to chance alone

Question 3

Genetic drift vs gene flow

Answer 3

• Gene flow occurs due to chance alone
• Genetic drift involves organisms physically moving to another location

Question 4

Measurement of Gene Flow

Answer 4

Using neutral genetic markers, gentic variants that don’t lead to protein changes so that they can’t be affected by natural selection

Question 5

Stochastic vs Deterministic Forces of Evolution

Answer 5

Stochastic forces are unpredictable or random while deterministic forces are predictable or non - random

Question 6

Examples of Stochastic Forces

Answer 6

Mutation, recombination, genetic drift

Question 7

Examples of Deterministic Forces

Answer 7

Natural selection

Question 8

Migration

Answer 8

Movement of organisms into a new population

Question 9

Types of Gene Flow Events

Answer 9

Population bottleneck and founder events

Question 10

Population Bottleneck

Answer 10

Type of gene flow event. Invovles a single sharp reduction in abundance, causes loss of divesity

Question 11

Founder Event

Answer 11

Type of gene flow event. Colonization by a few individuals that start a new population, contains fraction of divesity of the original population

Question 12

Type of Movement of Human Migration

Answer 12

Founder event

Question 13

Phenotypic Plasticity

Answer 13

The ability of a genotype to modify its phenotype in response to a particular environment

Question 14

How phenotypic plsticity occurs

Answer 14

Through modifications to development, growth and/or behavior