Hardy-Weinberg Model Video Lessons

Concept

# Problem: In cats, the Xb allele causes orange coat color and the XB allele causes black coat color. The alleles are X-linked and codominant, so heterozygotes are calico. Assume that a population offeral cats is in Hardy-Weinberg equilibrium, 70% of male cats in the population are black and 9% of female cats are orange. The frequency of the XB allele is _____ and we expect _____ offemale cats to be calico.A. 49%; 42%B. 70%; 42%C. 30%; 42%D. 70%; 49%E. 49%; 30%

###### FREE Expert Solution

In a Hardy-Weinberg equilibrium, the population maintains a constant frequency for the alleles, and the genotypes of the gene in question. In the given problem, 70% of male cats in the population are black and 9% of female cats are orange. Male cats only have one X chromosome, thus, would not have calico coat color, Allele frequencies, therefore, would be equivalent to their genotypic frequencies: 0.7 XB and 0.3 Xb

###### Problem Details

In cats, the Xb allele causes orange coat color and the XB allele causes black coat color. The alleles are X-linked and codominant, so heterozygotes are calico. Assume that a population offeral cats is in Hardy-Weinberg equilibrium, 70% of male cats in the population are black and 9% of female cats are orange. The frequency of the XB allele is _____ and we expect _____ offemale cats to be calico.

A. 49%; 42%

B. 70%; 42%

C. 30%; 42%

D. 70%; 49%

E. 49%; 30%