Abeka Biology Test 3 Practice

Having two identical alleles for a gene means the plant is homozygous for that gene. In diploid organisms, each gene comes with two copies, one from each parent. If those two copies are the same variant, the genotype is homozygous and the trait that appears can be either the dominant or the recessive phenotype, depending on which allele they are. If the alleles are different (one variant from each parent), that’s a heterozygous genotype, and often the dominant allele masks the recessive one in the phenotype.