Explain why the crossbreeding of bison and cattle is both a benefit and hindrance to conservation efforts aimed at protecting bison genetic diversity.

Crossbreeding between Bison and Cattle is a benefit as it will allow the Bison to acquire desirable traits from cattle and vice versa resulting in increased diversity in Cattle and hybrid vigor while on the other hand the gene-pool of the Bison will become mixed with that of the Cattle so the pure diversity of Bison will decrease.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.