BIOA01H3 Chapter Notes - Chapter 21: Allele Frequency, Genetic Drift, Genotype

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Migration: the movement of individuals from one population to another resulting in gene flow. Gene flow: the movement of alleles from one population to another: for instance, if there is a population of rabbits (white) on an island and on another island another population of rabbits (black). The construction of a bridge would result in the movement of black and white rabbits to the other islands: migration causes homogenizing of populations, mutations are essential for genetic variation and evolution. In smaller populations, derivatives of the expected outcome are expected as any change (individual failing to breed) can result in a drastic change from the expected allele frequency. Bioa01: random mating: the selection of mates without regarding phenotype, non-random mating: the preferential selection of mates based off genotypical traits, rearranges the allele frequencies of the existing gene pool. Inbreeding: mating between close relatives: results in the increase of homozygote frequency and the decrease of the heterozygote frequency.

Related Questions

A population of finches lives on an island some distance from the mainland, where another population of finches of the same species resides. In both populations, the size of the birds' beaks is influenced by two alleles at the beak locus, B and b. On the island, the frequency of the B allele is 0.9, and the frequency of the b allele is 0.1. On the mainland, both alleles are equally frequent (0.5).

a. If the genotypes at the beak locus have the following fitnesses on the island: w_BB = 1, w_Bb = 0.95, w_bb = 0.9, what is the change in the frequency of the B allele on the island in one generation due to natural selection?

b. What will be the change in the frequency of the B allele on the island in one generation as a combined result of migration and natural selection?

c. If the migration rate from the mainland to the island is 0.05 (meaning that 5% of individuals in the island population migrate in from the mainland every generation), what is the change in the frequency of the B allele in one generation due to migration? Assume there is no migration from the island back to the mainland.

Popgen 8: suppose two alleles, C and D, control flower color, CC plants have red flowers, while CD and DD plants have pink flowers. Suppose that in a population of 1000 individuals, I count 840 pink flowered plants. Assuming that the population is in Hardy- Weinberg equilibrium, what is the frequency of the allele C? Correct answer is 0.4 but dont know how to solve for it.

Popgen 9: Popgen 9: Consider a process of one-way migration from a very large population into a small population. A gene has two alleles A1 and A2. The frequency of A1 in the small population (p-small) is 0.3, and the frequency of A1 in the large population (p-large) is 0.8. Assuming a migration rate of m = 0.1, and no mutation, selection, or genetic drift, what do you expect to see in the next generation?

Popgen 14: Recall our model of one-way migration from a large mainland onto a small island. Consider two alleles A1 and A2. The frequency of allele A1 on the mainland (p-mainland) is 0.2, while the frequency of A1 on the island (p-island) is 0.8. The rate of migration from the mainland to the island per generation is 0.1. What is the expected value of p'-island, the frequency of A1 on the island after one generation?

coffeeserval150

Match the following into these 3 category's: natural selection, genetic drift, gene flow

1. Consistently causes a population to become better adapted to its environment
2, cannot cause a harmful allele to become more common
3. can introduce new allele into a populations gene pool
4. causes allele frequencies to fluctuate rapidly'
5. a result of differential success in reproduction
6 responsible for the founder effect
7. responsible for the bottleneck effect
8., a result of the movement of fertile individuals or their gametes

yellowjackal723

BIOA01H3 Chapter Notes - Chapter 21: Allele Frequency, Genetic Drift, Genotype

BIOA01H3 Full Course Notes

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