In a population of humans, the frequency of straight hair is 34 percent. If straight hair is the recessive phenotype, what is the frequency of the homozygous recessive genotype?

The frequency of the recessive phenotype is also 34%

There are 3 genotypes: Homozygous Dominant, Hetrozygous Dominant, and Homozygous Recessive. There is no such thing as Hetrozygous Recessive as a Dominant trait will express it self over a Recessive.

Lets say the letter for Curly hair is H and the letter for straight hair is h.

Now lets make a legend for the genotypes

Homozygous Dominant: HH

Heterozygous Dominant: Hh

Homozygous Recessive: hh

Since straight hair is a recessive gene and is only expressed when there is no dominant gene, the genotype for straight hair is "hh"

Therefore, the frequency of the homozygous recessive genotype which is the frequency for straight hair, is 34%