In a population of butterflies that has two alleles at a locus for spots, no spots (N) and spots (S) , there are 20 individuals with the NN genotype, 40 with the NS genotype, and 40 with the SS genotype. What is the frequency of N in the population?

A) 0.4
B) 0.2
C) 0.6
D) 0.8
E) none of the above

Allele Frequency

The relative frequency of an allele (a variant form of a gene) at a particular gene locus in a population, expressed as a proportion or percentage.

Butterfly Populations

Groups or communities of butterflies, which can serve as indicators of environmental change due to their sensitivity to habitat and climate.