Alleles are A. True breeding homozygotes B. Different molecular forms of a gene C. Heterozygotes D. Different phenotype
Option B An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
