6. Coat color in sheep is determined by a single gene. Allele B, for white wool,
ID: 24109 • Letter: 6
Question
6. Coat color in sheep is determined by a single gene. Allele B, for white wool, is dominant over allele b,for black wool. We have followed a population of sheep for two years. Below are the statistics we have
compiled.
Year 1 Year 2
White sheep 489 682
Black sheep 128 176
Total number of individuals 617 858
a) Determine the frequency of both alleles (B & b) in year 1.
b) Determine the frequency of both alleles (B & b) in year 2.
c) Is this population in Hardy-Weinberg equilibrium? Why or Why not?
Explanation / Answer
Coat color in sheep is determined by a single gene. Allele B, for white wool, is dominant over allele b,
for black wool. We have followed a population of sheep for two years. Below are the statistics we have
compiled.
Year 1 Year 2
White sheep 489 682
Black sheep 128 176
Total number of individuals 617 858
a) Determine the frequency of both alleles (B & b) in year 1.
BY USING SQUARE ROOT METHOD
128/617= .2074 . .--------- . Q^2
q = freq b = .2074 = .45
p = freq B = .55
b) Determine the frequency of both alleles (B & b) in year 2.
176/858= .2051 . .--------- . Q^2
q = freq b = .2051 = .45
p = freq B = .55
c) Is this population in Hardy-Weinberg equilibrium? Why or Why not?
It is in H-W equilibrium, because there was no appreciable change in frequencies from year 1 to year 2
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