If a genotype has two identical alleles that are always expressed is called Purebred.
What do you mean by Genotype?
A genotype may be defined as the ultimate combination of alleles of those genes which are particularly selected for studies.
Genotypes that consist of identical alleles are known as purebred. While if the alleles are arranged differently in any genotypes, it is referred to as heterozygous (hybrid).
Therefore, if a genotype has two identical alleles that are always expressed is called Purebred.
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