Aheterozygous individual has a for a trait being studied. a. haploid condition, in genetic terms b. pair of identical alleles c. pair of nonidentical alleles

The correct answer is c. A heterozygous individual has a pair of nonidentical allele for a trait being studied.  
Because humans are diploid, they have two matching sets of chromosomes and the same locus gene on each of their two sets of homologous chromosomes (exception in males, because they have XY chromosomes). If alleles (a variant form of a given gene) are the same, the organism is homozygous, otherwise, it is heterozygous for that loci.

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