41+ Dominant Allele Definition Biology Simple Images. Alleles aren't always fully dominant or recessive to one another alleles aren't always fully dominant or recessive to one another, but may instead display codominance or incomplete dominance. In genetics, dominance is the phenomenon of one variant (allele) of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.
It was first studied by gregor mendel.
Five generations of random mating. Two copies will still give you brown eyes. Incomplete dominance = one allele is not completely dominant over the other (blend) heterozygous condition somewhere in between (flowers…red, white codominance= condition in which both alleles for a gene are expressed when present (cattle…red, white, roan coat). Polygenic traits do not follow simple mendelian rules of genetics, since multiple genes interacting complicate the inheritance of these traits.
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