The following numbers represent the numbers of genotypes coding for blue, red, a
ID: 194793 • Letter: T
Question
The following numbers represent the numbers of genotypes coding for blue, red, and green coloration in the fish population. The numbers are shown for three successive generations of the population.
Blue Color
Red Color
Green Color (Genotype=BB) (Genotype=BG) (Genotype=GG)
Gen 1 25 50 25
Gen 2 30 40 30
Gen 3 50 25 50
Which of the following scenarios could not explain the changes in genotype frequencies above?
a. The blue and green fish prefer differ food sources.
b. The red fish are poorly adapted to the enviornment (disfavored by selection)
c. The blue and green fish preferentially mate with their own type.
d. There is random mating among all of the fish genotypes.
The answer is D. Please provide explanation and steps.
Explanation / Answer
Answer : D
Because, if there is random mating, then the genotype frequency would be 25 % homozygous dominant, 25 % homozygous recessive and 50 % heterozygous.
And, this frequency is maintained in each generation and it does not change.
But in the given question, only generation1 satisfies the random mating rule.
Generation 2 and 3 does not satisfy the random mating rule.
Therefore, there is non-random mating (option C), natural selection (option B) and migration (option A)
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