In one kind of butterfly, brown color is caused by a dominant allele, B, and white color is caused by a recessive allele, b. The table shows the observed numbers of phenotypes in a population of 100 butterflies.


Phenotype
Number of individuals
Brown
84
White
16



What is the frequency of the heterozygous genotype in this population of butterflies?
0.24
0.36
0.48
0.60