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How to calculate gene frequency

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1. In Chihuahuas, being loud and obnoxious is dominant over calm and passive. If 17% of a population of feral Chihuahuas is quiet, what percentage would you expect to be heterozygous for this trait? If your population contained 2,300 dogs, how many homozygous noisy dogs would there be?

2. In frogs, being spotted is dominant over striped, and you can tell heterozygotes by their foot structure. Provide allele and expected genotype frequencies for a population containing 74 homozygous spotted, 58 heterozygous spotted, and 66 striped frogs.

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Solution Preview

1. Let 'a' be dominant and 'b' recessive gene.
According to Hardy law : a + b = 1
or a2 + 2ab + b2 = 1

According to question b2 = ...

Solution Summary

Gene and genotype frequency can be calculated with the help of Hardy-Weinberg law.

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See Also This Related BrainMass Solution

Calculate the relative fitness of genotypic constitution and their frequency after one generation

1. A population of gerbils has three color morphs, color is determined by a single locus.

BB is BLACK, Bb is BROWN, bb is yellow.
Black has a 25% chance of surviving to adulthood, and has 10 offspring as an adult
Brown has a 50% chance of surviving to adulthood, and has 5 offspring as an adult
Yellow has a 25% chance of surviving to adulthood, and has 5 offspring as an adult
What are the relative fitnesses of each genotype?
If the initial frequency of the B allele is .75, what is the frequency of that allele after one generation?

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