The accompanying figure examines a genetic drift study where flour beetles were

Question

The accompanying figure examines a genetic drift study where flour beetles were bred in groups of 10 beetles or 100 beetles. The beetles were all heterozygous for the alleles b and b+ at the beginning of the experiment. The frequency of the b+ allele was measured after each generation.

a. How does population size influence genetic drift?
b. What happened to the b+allele in the population that the arrow is pointing to in the upper figure? What is the term to describe the six populations that reached 100% b+ allele frequency in the upper figure?
c. In both populations there is a trend towards rising b+allele frequencies. What does this trend suggest is happening?

100% 50%. 100% A The flour beetle (ribolium castaneum), shown here on a flake of cereal. 16 generations 10 breeding individuals 12 16 generations 100 breeding individuals

Explanation / Answer

A. The smaller population size can bring more genetic drift . Genetic drift means change in the allele frequency due to either migration of half of the population by environmental calamaties or by choice or any other reason. Now the reason is that small population can migrate easily large cannot. Through natural calamities also they can be separated easily.

B. The allele frequency b+ is becoming zero where the arrow is pointing means it is homozygus species are produced due to genetic drift the hetetozygus cannot mate .

The 100% of b+ frequency indicates founders effect

C. B+ allele frequency is increasing means homozygus are forming more. Instead of genetic variation no genetic variation will come in population.

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