Calculating Pop. Frequencies Extra Questions

Calculating Pop. Frequencies Extra Questions - Activity...

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Activity: Calculating Population Frequencies – Extra Questions- KEY 1. 2% of a certain population has an autosomal recessive disease. a) What is the frequency of the dominant gene? q 2 = 2% = 0.02 q p q = √0.02 = 0.14142……. p = 1 – q, therefore p = 1-0.14142……. =0.858578644 (0.86) b) What is the frequency of individuals who carry the disease? Must find 2pq 2pq= 2(0.14142……. x 0.858578644) = 0.242842713 (0.24) 2. In a certain population 36/500 individuals is affected by an autosomal dominant disorder. Find the frequency of the dominant allele. 36/500 individuals = p 2 and 2pq part of the population together. 464/500 individuals therefore = not affected = q 2 q 2 q p q 2 = 464 / 500 = 0.928 q = √0.928 = 0.9633 p = 1-q, therefore p= 1-0.9633 = 0.03997…… (0.04) 3. A flower’s color is determined by the interaction of 2 alleles: If the frequency of red genes is 0.7 and the frequency of white genes is 0.3 in a gene pool, what is the expected frequency of flowers with red and white speckles? P 1 = Red alleles = 0.7
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