Answer
b. pair of nonidentical alleles
Work Step by Step
In a heterozygous individual, for a trait being studied, the individual possesses a pair of nonidentical alleles. This means that the two alleles for the trait are different from each other. This is in contrast to a homozygous individual, where the pair of alleles are identical. Additionally, the term "haploid condition" refers to a situation where an organism has only one set of chromosomes, which is not applicable in the context of a heterozygous individual.
