Multiple choice An allele is defined as another word used for a gene a homozygous genotype a heterozygous genotype one among the many possible forms of a particular gene Reveal answer Fill a bubble to check yourself D Correct answer Explanation An allele is one of two or more alternate forms of a gene. If an individual is homozygous (YY or GG) for a trait, it has inherited the same allele from both parents. If it is heterozygous (YG), it has inherited different alleles for the trait.