Yellow hair is an X-linked trait in llamas, which have XX females and XY males,

Question

Yellow hair is an X-linked trait in llamas, which have XX females and XY males, but it is not known whether the trait is conferred by a dominant or recessive allele. The population appears to be in Hardy-Weinberg equilibrium. You can still calculate an allele frequency by looking at the males, and the population includes 421 yellow-haired male llamas and 13 brown-haired male llamas.

a) What is the allele frequency for yellow hair?

b) The population also includes 404 yellow-haired females and 26 brown-haired females. Is yellow dominant or recessive? Justify your answer.

Explanation / Answer

a )
At all the time begin with homozygous recessive , which is equal to q2

The frequency of brown-haired male llamas = 13 / 100 = .13 (.13 = q2)

q = .065 = the frequency of brown-haired male llamas

so q = .065 = the frequency of brown-haired male llamas

and P + Q = 1

thus ,
p = .935

Allele frequency for yellow hair = .935

b)
yellow is dominant

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