Question

Locus Green codes for a gene that can make lobsters green instead of red. Only gg individuals are green, whereas GG and Gg individuals are red. The genotype frequencies in a population of 100 lobsters sampled in Maine, USA, are GG = 0.20, Gg = 0.50, gg = 0.30. What is the frequency of allele g?

1) 0.75
2) 0.45
3) 0.65
4) 0.85
5) 0.55

Answer 1

The frequency of allele g can be determined by using the genotype frequencies in the population and the formula p + q = 1. In this case, the frequency of allele g is 0.65. Option number 3 is correct.

Step-by-step explanation:

The frequency of allele g can be determined by using the formula p + q = 1, where p represents the frequency of the dominant allele (G) and q represents the frequency of the recessive allele (g). In this case, given the genotype frequencies in the population, we can determine the frequency of allele g by adding the frequencies of the Gg and gg genotypes.

The frequency of Gg individuals is 0.50 and the frequency of gg individuals is 0.30, so the frequency of allele g (q) can be calculated as 2 * 0.50 + 0.30 = 1.30. However, because each individual carries two alleles, we need to divide this value by 2 to get the frequency of a single allele. Therefore, the frequency of allele g is 0.65, which corresponds to option 3.