Suppose the human trait for dimples is controlled by a simple dominant and recessive relationship at one locus. Dimples, D$,$ is

Learr

the dominant allele, and a lack of dimples, d$,$ is the recessive allele.

lan

In a college genetics class, the professor takes a tally of students who have dimples and of students with a lack of dimples. In this class of $117$ students, $37$ have dimples.

aa

Calculate the frequency of the dominant allele, D$,$ and the heterozygous genotype, Da$.$ Express the frequencies in decimal form rounded to the nearest thousandth. Assume the class is in Hardy$-$Weinberg equilibrium for this trait.

frequency of D:

$+90$

possible

frequency of Dd: