The Graphs Below Show the Frequency of the B+ Allele

The graphs below show the frequency of the b+ allele over twenty generations in two populations of heterozygous flour beetles (data for a population of ten individuals is shown in graph A; data for a population of one hundred individuals is shown in graph B) .Why does the frequency of the b+ allele increase in both populations?

A) b+ is a lethal allele
B) b+ is a balanced polymorphism
C) b+ is a fixed allele
D) the b+ allele is adaptive
E) b+ is a neutral mutation

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