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Question
What is co-dominance? With the help of example explain co-dominance in human-being.
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Solution
Co-dominance is a heterozygous condition in which both alleles at a gene locus are fully expressed in the phenotype. Alleles which show an independent effect are called as Co-dominant alleles. In co-dominance, neither phenotype is completely dominant.
The best example of co-dominance is ABO blood group. ABO blood grouping is controlled by gene I which has three alleles A, B, and O and show co-dominance. An O allele is recessive to both A and B. The A and B alleles are co-dominant with each other. When a person has both A and B, they have type AB blood. In co-dominance, it does not matter whether the alleles in the homologous chromosomes are dominant or recessive. If the homologous chromosome consists of two alleles that can produce proteins, then both will be produced and forms a different phenotype or characteristics to that of a homozygote.
Co-dominance is a heterozygous condition in which both alleles at a gene locus are fully expressed in the phenotype. Alleles which show an independent effect are called as Co-dominant alleles. In co-dominance, neither phenotype is completely dominant.
The best example of co-dominance is ABO blood group. ABO blood grouping is controlled by gene I which has three alleles A, B, and O and show co-dominance. An O allele is recessive to both A and B. The A and B alleles are co-dominant with each other. When a person has both A and B, they have type AB blood. In co-dominance, it does not matter whether the alleles in the homologous chromosomes are dominant or recessive. If the homologous chromosome consists of two alleles that can produce proteins, then both will be produced and forms a different phenotype or characteristics to that of a homozygote.
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