In a population of tree frogs, the allele that causes yellow eyes (Y) is dominant over the allele that causes orange eyes (y). If 85% of the frogs have yellow eyes, what is the frequency of the dominant allele?

0.15

0.39

0.52

0.61

Question

In a population of tree frogs, the allele that causes yellow eyes (Y) is dominant over the allele that causes orange eyes (y). If 85% of the frogs have yellow eyes, what is the frequency of the dominant allele?

 0.15

 0.39

 0.52

 0.61

anonymous · Answer

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If 85% have yellow eyes, then 15% must have orange eyes...and since only homozygous recessive (yy) have orange eyes, then p^2 = 0.15... so square root that and then use 1=p+q