If two persons with 'AB' blood group marry and have a sufficiently large number of children, these children could be classified as 'A' blood group: 'AB' blood group: 'B' blood group in 1: 2:1 ratio. The modern technique of protein electrophoresis reveals the presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of
Correct answer: C. Co-dominance
- A. Partial dominance
- B. Complete dominance
- C. Co-dominance
- D. Incomplete dominance
Explanation
The phenomenon of expression of both alleles in a heterozygote is called co-dominance. The alleles that do not show dominancerecessive relationships and are able to express themselves independently when present together are called codominant alleles. As a result, the heterozygous condition has a phenotype different from either of the homozygous genotypes, e.g., alleles for blood group A (IA) and for blood group B (IB) are codominant so that when they come together in an individual, they produce blood group AB.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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