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What is a homozygous allele?

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So, in order for an organism to show a recessive trait, it must be homozygous for the recessive allele. In that case, there's no dominant allele there to throw its weight around in terms of phenotype. So, what's the genotype of an albino in our example? It has to be aa, homozygous recessive. read more

For example, the allele that gives rise to albinism is recessive, and the allele for normal pigment production is dominant. That means that a heterozygous individual with the genotype Aa, who has one copy of the normal allele and one copy of the albinism allele, would not be an albino. read more

A homozygous recessive allele combination contains two recessive alleles and expresses the recessive phenotype. Example: The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r). read more

In an organism, zygosity is the level of similarity between the genetic alleles for a given trait. While few traits show the presence of just one allele (low variation), many others exhibit the presence of two or more alleles. Based on the similarity of these alleles, the genetic trait is said to homozygous or heterozygous. read more

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