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Given a scientific passage and an answer, generate a question for the given answer.

Passage: When gametes unite during fertilization, the resulting zygote inherits two alleles for each gene. One allele comes from each parent. The alleles an individual inherits make up the individual's genotype . The two alleles may be the same or different. As shown in Table below , an organism with two alleles of the same type ( BB or bb ) is called a homozygote . An organism with two different alleles ( Bb ) is called a heterozygote . This results in three possible genotypes. Answer: alleles
Output:
When gametes unite during fertilization, the resulting zygote inherits two of what for each gene, one from each parent?