Gene Frequency and Migration Effects

The video tutorial covers the Hardy-Weinberg law of genetic equilibrium, explaining that gene and genotype frequencies remain constant in large, random-mating populations without selection, migration, or mutation. It highlights how migration affects gene frequency by introducing new individuals into a population, altering genetic mean and variance. The tutorial provides formulas to calculate gene frequency in mixed populations and the change in gene frequency due to migration. An exercise is given to apply these concepts, involving calculating gene frequency and Delta Q with provided data.

What does the Hardy-Weinberg law of genetic equilibrium state about gene frequencies in a large random mating population?

• They fluctuate randomly without any pattern.

• They decrease due to natural selection.

• They increase over time regardless of external factors.

• They remain constant in the absence of selection, migration, and mutation.

Which of the following is NOT a factor that can change gene and genotype frequencies in a population?

• Mutation

• Migration

• Random mating

• Selection

What is the primary effect of migration on a population's gene frequency?

• It stabilizes the gene frequency.

• It increases the population size without affecting gene frequency.

• It causes a change in gene frequency.

• It eliminates genetic variance.

Who are considered emigrants in the context of migration?

• Individuals moving out of a population

• Individuals moving into a population

• Individuals that remain in their original population

• Individuals that do not participate in mating

In the formula for calculating gene frequency in a mixed population, what does 'M' represent?

• The frequency of a dominant allele

• The proportion of migrants

• The frequency of a recessive allele

• The total population size

How is the frequency of a recessive allele in the mixed population calculated?

• By subtracting the frequency of the dominant allele

• By multiplying the frequency of the allele in migrants by the proportion of migrants and adding it to the product of the frequency in natives and their proportion

• By adding the frequencies of all alleles

• By dividing the total number of alleles by the population size

What is the formula for calculating the change in gene frequency due to migration?

• Delta Q = Q1 * Q0

• Delta Q = Q0 - Q1

• Delta Q = Q1 - Q0

• Delta Q = Q1 + Q0

What is the significance of calculating Delta Q in population genetics?

• It predicts the future population growth rate.

• It helps in determining the total population size.

• It indicates the change in gene frequency due to migration.

• It measures the genetic diversity within a population.

In the homework problem, what is the initial frequency of the gene among the natives before immigration?

• 0.6

• 0.5

• 0.4

• 0.3

What percentage of the population consists of immigrants in the given homework problem?

• 20%

• 15%

• 10%

• 5%