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?

##42%##

##P^2=9##

##P=sqrt9##

##P=0.03##

Applying the Hardy-Weinberg equation

##P+Q=1##

Giving values

##0.03+Q=1 ##

##Q=1-0.03##

##Q=0.07##

For heterozygotes, we have

##2PQ##

Therefore, putting values for ##P## and ##Q##, we have

##2 xx 0.03 xx 0.07 = 0.42 =42%##