allele frequencies in a population will not change from generation to generation. if the allele frequencies in a population with two alleles at a locus are p and q, then the expected genotype frequencies are p2, 2pq, and q2.
What happens to the allele frequency over time?
The allele frequency represents the incidence of a gene variant in a population. … Changes in allele frequencies over time can indicate that genetic drift is occurring or that new mutations have been introduced into the population.
What can change gene frequencies from one generation to the next?
Gene frequencies can change from one generation to another by a process of pure chance known as genetic drift.
Why is there a 2 in 2pq?
The term p2 represents the frequency of dominant homozygotes (AA) and the term q2 represents the frequency of recessive homozygotes (aa). p represents the allele frequency of allele A, and q represents the allele frequency of the allele a.
Why is Hardy-Weinberg not realistic?
Explanation: All of the answer choices are assumptions made when considering Hardy-Weinberg equilibrium. Thus, the model is not very realistic in nature, since these conditions are rarely met. Also, no natural selection is assumed to occur.
What is the factor that has the greatest impact on allele frequencies?
Gene Flow. Gene flow occurs when individuals move into or out of a population. If the rate of migration is high, this can have a significant effect on allele frequencies. The allele frequencies of both the population they leave and the population they enter may change.
What are two factors that change gene frequencies in a population?
Factors that disturb the natural equilibrium of gene frequencies include mutation, migration (or gene flow), random genetic drift, and natural selection.
How do you find the frequency of a recessive allele?
To determine q, which is the frequency of the recessive allele in the population, simply take the square root of q2 which works out to be 0.632 (i.e. 0.632 x 0.632 = 0.4).
How does population size affect genetic drift?
Population size, technically the effective population size, is related to the strength of drift and the likelihood of inbreeding in the population. Small populations tend to lose genetic diversity more quickly than large populations due to stochastic sampling error (i.e., genetic drift).
Is genetic flow random?
These include: mutation, random genetic drift and gene flow. … Genetic drift is a random process in which chance plays a role in deciding which gene variants (alleles) survive. Gene flow occurs when genes are carried from one population to another.