Question

alternate forms of the same gene (eg. a1,a2,a1,a2) are given this name, ____________. genotypes alleles heterozygotes allelotypes

Explanation:

In genetics, alleles are the alternate forms of a single gene. Genotypes refer to the genetic constitution of an individual. Heterozygotes are organisms with different alleles at a particular gene - locus. Allelotypes are not a standard term for alternate gene forms like alleles.

Answer:

B. alleles