Genetic Frequencies and Processes

The video tutorial introduces the Hardy-Weinberg equilibrium, focusing on calculating the frequency of homozygous recessive and heterozygous genotypes. It explains the impact of migration on human evolution, highlighting gene flow and genetic drift. The tutorial concludes with a discussion on non-random mating and its effects on genetic diversity.

What is the frequency of the dominant allele if the recessive allele frequency is 0.3?

• 0.3

• 0.5

• 0.7

• 1.0

How do you calculate the probability of randomly selecting a recessive allele twice?

• Multiply the probabilities

• Subtract the probabilities

• Add the probabilities

• Divide the probabilities

What is the frequency of individuals homozygous for the recessive allele if its frequency is 0.3?

• 0.7

• 0.42

• 0.21

• 0.09

How do you calculate the frequency of a heterozygous genotype?

• Add the frequencies of both alleles

• Multiply the recessive allele frequency by itself

• Multiply the dominant allele frequency by itself

• Multiply the dominant and recessive allele frequencies and double the result

Why must the heterozygous genotype frequency be doubled in calculations?

• To account for errors

• It is a standard rule

• There are two possible allele combinations

• To simplify calculations

What is genetic drift?

• A method of increasing genetic diversity

• A gradual change in allele frequencies due to fitness differences

• A process of allele frequencies remaining constant

• A sudden change in allele frequencies due to random events

How does genetic drift affect a population?

• Has no effect

• Decreases genetic diversity

• Always leads to extinction

• Increases genetic diversity

What is gene flow?

• The extinction of alleles

• The isolation of populations

• The random change in allele frequencies

• The movement of alleles between populations

How does migration affect gene flow?

• Decreases genetic diversity

• Increases genetic diversity

• Leads to genetic drift

• Has no effect

What is the main difference between genetic drift and gene flow?

• Both are due to migration

• Genetic drift is due to migration, gene flow is random

• Genetic drift is random, gene flow is due to migration

• Both are random processes