What is Codominance _ It’s Meaning and Definition A form of dominance in which the alleles.

What is Codominance _ It’s Meaning and Definition A form of dominance in which the alleles.

Codominance: Meaning & Definition

Codominance is a form of genetic inheritance in which both alleles of a gene in a heterozygous organism are fully expressed without one being dominant over the other. This results in a phenotype that clearly shows both traits.

Key Features of Codominance:

 Both alleles contribute equally to the phenotype.
 No blending of traits (unlike incomplete dominance).
 Traits appear simultaneously in heterozygous individuals.

Examples of Codominance:

Blood Type (AB Blood Group): A person inheriting both A and B alleles has blood type AB, where both antigens are expressed.
Roan Cattle: Cows with red and white hair patches instead of a mixed color.
Flower Colors: Some plants display both red and white petals instead of blending into pink.

Would you like a deeper explanation with Punnett squares?

What is Codominance?

Codominance is a form of inheritance in genetics where both alleles in a gene pair are fully expressed in a heterozygous individual. Unlike traditional dominance, where one allele masks the expression of the other, codominant alleles both contribute equally and visibly to the organism’s phenotype.

Definition of Codominance:

Codominance is a genetic condition in which two different alleles of a gene are equally and independently expressed in a heterozygous organism, resulting in a phenotype that shows traits from both alleles simultaneously, without blending.

Key Characteristics:

• Both alleles are dominant and fully expressed.

• No blending of traits occurs (unlike incomplete dominance).

• The heterozygous phenotype shows distinct features of both alleles.

Examples of Codominance:

1. AB Blood Type in Humans:

   • Alleles: IA and IB

   • Both alleles are codominant, so a person with genotype IAIB has blood type AB, which expresses both A and B antigens on red blood cells.

2. Roan Coat Color in Cattle:

   • Red allele + White allele = Roan coat (patches of red and white hair side by side).

   • Both coat colors appear distinctly.

3. Speckled Chickens:

   • Black-feather allele + White-feather allele = Chickens with black and white speckled feathers.

Codominance vs. Incomplete Dominance

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What is Codominance _ It’s Meaning and Definition A form of dominance in which the alleles.

Incomplete dominance and co-dominance

allele-and-its-dominance.pdf