Question: Male Trinidadian guppies use bright red patches of color to attract mates. Your colleague has rec…

Male Trinidadian guppies use bright red patches of color to
attract mates. Your colleague has recently sequenced 400 individual
guppies at the opsin gene that controls sensitivity to red
wavelengths of light. He has found a new variant of this gene that
increases sensitivity to red in his samples. Unfortunately, a
computer malfunction has scrambled his data and he no longer knows
which alleles came from heterozygotes or homozygotes. Based on his
records, 80 of the 800 alleles sequenced are the new variant. If
this gene is in H-W equilibrium in this population, how many
individuals from his sample of 400 should be homozygous for the new
allele?