A population of dandelions has the following genotype frequencies: 45% AA, 35% A

Question

A population of dandelions has the following genotype frequencies: 45% AA, 35% Aa, and 20% aa. What is the frequency of the “a” allele?

Phenylketonuria (PKU): inherited inability to break down the amino acid phenylalanine. If untreated it leads to severe mental disabilities. Assume that the US population is in equilibrium with respect to this gene. PKU is due to a recessive allele. US PKU rate: 1 out of every 10,000 babies born, or q2 = 0.0001. What percent of the US population have no alleles for PKU?

Explanation / Answer

A population of dandelions has the following genotype frequencies: 45% AA, 35% A

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