alleles
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 individuals 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.
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