Question

Cystic Fibrosis is a homozygous recessive disease that affects 1 in 3400 people. What percent of the population are carriers?

Answer 1

Answer:

1 in 3400 means 1/3400×100 = 0.03 it is % of recessive gene

Then, % of dominant gene = 1- 0.03 = 0.97

Heterozygous individuals are carrier, so their population = 2pq = 2×0.03×0.97 = 0.0582, where p&q are dominant and recessive gene % respectively.

By numbers = 0.0582×3400 = 198 people

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