In the formula for determining a population's genotype frequencies, the pq in the term 2pq is necessary because

In the formula for determining a population's genotype frequencies, the pq in the term 2pq is necessary because 





A) the population is diploid.
B) heterozygotes can come about in two ways.
C) the population is doubling in number.
D) heterozygotes have two alleles.




Answer: B


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