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# popgenans - Biol 215 Population Genetics Practicing your Ps...

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Biol 215 Population Genetics Practicing your P s and Q s 1. A wild population of a butterfly species consists of 99% orange butterflies and 1% yellow. Genetic tests proved the yellow form is due to an autosomal recessive gene. Estimate the percentage of heterozygotes in the population. What assumptions have you made in order to reach this estimate. yy=q 2 =0.01 q= 0 . 01 =0.1 p-1-0.1=0.9 2pq=0.18 Yy=18% Assuming a H-W equilibrium. 2. If 6% of the males in a population have the same type of sex-linked recessive red-green color blindness, estimate the frequency of women in the population with this same type of color blindness. What proportion of the women will have normal color vision but nevertheless have half of their sons color blind because of this gene? X Y=0.06 X =q=0.06 q 2 =0.0036= X X females=0.36% normal, carriers: 2qq q-0.06 p=1-0.06=0.94 2pq=0.11=11% 3. From a population 80% normal and 20% heterozygous for an autosomal recessive lethal, what percentage of the next
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