Three populations of white-tailed deer were genotyped for albinism, a recessive
ID: 57992 • Letter: T
Question
Three populations of white-tailed deer were genotyped for albinism, a recessive trait . The observed genotype frequencies are shown in the table below.
Population
Homozygous wild-type (AA)
Heterozygous wild-type (Aa)
Albino
(aa)
1
0.75
0.10
0.15
2
0.8
0.18
0.02
3
0.65
0.30
0.05
What is the expected genotype frequencies in each population?
Which of the populations is most likely to show each of the following characteristics: random mating, inbreeding, genetic drift? Justify your answers. Each population matches with one of the characteristics.
Population
Homozygous wild-type (AA)
Heterozygous wild-type (Aa)
Albino
(aa)
1
0.75
0.10
0.15
2
0.8
0.18
0.02
3
0.65
0.30
0.05
Explanation / Answer
1. Expected genotypic frequencies,
Population 1: p2 = 0.75; p (frequency of dominant allele) = 0.86, q (frequency of recessive allele) = 1- 0.86 = 0.14
Population 2: p2 = 0.8; p = 0.89, q = 1- 0.89 = 0.11
Population 3: p2 = 0.65; p = 0.80, q = 1- 0.80 = 0.20
Population 1: ------> Inbreeding (Inbreeding causes loss of heterozygosity, the heterozygous population is very small in population 1)
Population 2: Genetic drift (Allele frequencies change and homozygous population size increase)
Population 3: Random mating
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