Incomplete Dominance: When Alleles Mix to Produce Unique Phenotypes

situations in which one allele is not completely dominant over another allele for that gene is an example of what?

incomplete dominance

The situation in which one allele is not completely dominant over another allele for that gene is an example of incomplete dominance. In incomplete dominance, the heterozygous offspring display a phenotype that is intermediate to the phenotypes of the homozygous dominant and homozygous recessive individuals. This means that the dominant allele does not completely mask the expression of the recessive allele, resulting in a phenotype that is a blend of both alleles. For example, in snapdragons, homozygous red flowers crossed with homozygous white flowers results in heterozygous pink flowers. This is because the red allele does not completely dominate the white allele, resulting in a heterozygous phenotype that is a blend of both alleles.

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