What is codominance?

Codominance occurs when two alleles are equally dominant, resulting in both being expressed in the phenotype.

Answer in your head, out loud, or on paper, then tap the card to flip.

How is codominance different from complete dominance?

In codominance, both alleles are expressed, while in complete dominance only one allele is expressed.

Answer in your head, out loud, or on paper, then tap the card to flip.

How does codominance affect the phenotype?

Both alleles contribute to the phenotype, resulting in a mixture or blend of traits.

Answer in your head, out loud, or on paper, then tap the card to flip.

How are codominant alleles represented?

Codominant alleles are represented as different superscript uppercase letters to the right of an uppercase letter that represents the gene.


For instance, if C represents the gene for flower colour, and white and red flowers are codominant, the possible alleles would be represented as CW and CR.

Answer in your head, out loud, or on paper, then tap the card to flip.

State the genotype(s) of the offspring of a cross between a plant that produces white flowers (CWCW) and a plant that produces red flowers (CRCR).

The offspring will have the heterozygous genotype CWCR

Answer in your head, out loud, or on paper, then tap the card to flip.

State the phenotype of the offspring produced by  a cross between a plant that produces white flowers (CWCW) and a plant that produces red flowers (CRCR), given that the alleles for flower colour are codominant.

Given that the flower colour alleles are codominant, and that the CW allele would produce white flowers and the CR allele would produce red flowers, the offspring with the genotype CWCR would have flowers that are a blend between red and white.


Therefore, their phenotype would be to produce pink flowers.

Answer in your head, out loud, or on paper, then tap the card to flip.