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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.

https://www.gyanodhan.com/video/1A.%20Biology%20Definition/076.%20What%20is%20Codominance%20_%20It%27s%20Meaning%20and%20Definition%20%20%20A%20form%20of%20dominance%20in%20which%20the%20alleles.........mp4

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:


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

Feature Codominance Incomplete Dominance
Expression of alleles Both alleles are fully and equally expressed Phenotype is a blend of the two alleles
Resulting phenotype Shows traits from both parents clearly Intermediate between both traits
Example AB blood type, roan cattle Pink flowers (Red x White = Pink)

Let me know if you’d like a diagram or quiz to reinforce this concept!

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