Question

A pair of alleles is said to be heterozygous when

Answer 1

A pair of alleles is said to be heterozygous when they are of two different alleles in their genes, thus one allele is dominant over another allele. The other allele is said to be recessive.

Hope that was helpful.

Answer 2

Explanation:

An organism in which the two copies of the gene are identical — that is, have the same allele — is called homozygous for that gene. An organism which has two different alleles of the gene is called heterozygous.