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Homozygous means that the organism contains two copies of the same allele for a particular gene. Homozygous recessive means that the organism carries two recessive alleles. Such as with the example above, the white-flowered pea plant has two white alleles to make it be expressed that way.
When the alleles are identical, the individual is homozygous for that trait. While if the pair is made of two different alleles, the individual is heterozygous. A homozygous pair of can be either dominant (AA, BB) or recessive (aa, bb). Heterozygous pairs are made up of one dominant and one recessive allele (Aa, Bb).In heterozygous individuals only one allele, the dominant, gains expression while the other allele, the recessive, is hidden but still present.ot all copies of a gene are identical and alternative forms of a gene, called alleles, lead to the alternative form of a trait. Alleles are a way of identifying the two members of a gene pair which produce opposite contrasting phenotypes.