44+ Homozygous Allele Definition Biology Pics. That means both alleles contribute equally to the appearance of the trait. A homozygous dominant allele combination contains two dominant alleles and expresses the dominant phenotype (expressed physical trait).
An allele is a variation of a gene, identified by change in phenotype of organisms with that allele (relative to those carrying another or other alleles, usually the more common alleles), or by molecular means such as dna sequencing.
Gene is a segment of dna coding for a functional the phenotype or hair color for the resulting individual may be dark (aa homozygous dominant/ aa heterozygous condition). The first explanation is that the alleles which cause disease when homozygous, confer some benefit when heterozygous. If an organism has two copies of the same allele, for example aa or aa, it is homozygous for that trait. Hetero means 'different' and zygous means 'having zygotes of a specified kind'.
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