In humans, there is a phenotype for curly hair and a phenotype for straight hair. the homozygous dominant genotype cc is for curly hair, and the homozygous recessive genotype cc is for straight hair. heterozygous cc is a phenotype for wavy hair.

in a hypothetical population, 36% of people are born with straight hair (cc). what percentage of this population will have wavy hair?

Sample Answer - Frequency of the recessive genotype (straight hair), q2 is 0.36

The square root, q, of 0.36 = 0.6

p + q = 1 so p = 1 – 0.6 = 0.4

The frequency of curly hair with the homozygous CC combination is p2 = 0.16

The frequency of wavy-hair phenotype is 2pq = 2 * 0.4 * 0.6 = 0.48

So 48% of the population will have wavy hair.

answer; both surfaces of the membrane are nonpermeable

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