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Population genetics

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Sample exercises

University · Population genetics

A sample contains 10 AA,20 Aa,10 aa diploid individuals. Find frequency of A.

Answer and explanation

0.5

(2×10+20)/(2×40)=0.5.

University · Population genetics

For p=0.6 in a two-allele model, find q.

Answer and explanation

0.4

p+q=1.

University · Population genetics

Under Hardy-Weinberg assumptions with p=0.6,q=0.4, find expected heterozygote proportion.

Answer and explanation

0.48

2pq=2×0.6×0.4.

University · Population genetics

Which counts allele frequency correctly?

  1. Only the largest genotype group
  2. Only individuals with at least one copy
  3. Only dominant phenotypes
  4. Allele copies divided by all relevant copies
Answer and explanation

Allele copies divided by all relevant copies

Diploids can carry zero, one or two copies of the allele.

University · Population genetics

Why are Hardy-Weinberg proportions not a universal rule for every observed sample?

Answer and explanation

They follow specified assumptions and refer to a population model; sampling variation and biological processes can produce departures.

Credit model assumptions and finite samples.

University · Population genetics

Which process can change allele frequencies by random sampling?

  1. Genetic drift
  2. A change in chart font
  3. Changing units only
  4. Relabelling identical data
Answer and explanation

Genetic drift

Drift refers to random changes in allele frequencies.

Study notes