For an X-linked recessive trait, 9% of the females in the population are affected. What percent of the males would be affected? What percentage of the population is represented by the carriers?

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Answer 1 · 2016-12-12T00:55:27

Castle Hardy Weinburg for the female population only:

#1 = q^2 + 2*p*q + p^2#

#1 = q + p#

where it tells you that #p^2 = 0.09#, so

#p = 0.3" "# and #" "q = 0.7#.

Carriers are heterozygous females, so:

#"heterozygous" = 2 * p * q = 2 * 0.3 * 0.7 = 0.42#

#42%# of females are carriers.

That's the first part.