Which of the following characteristics represent ‘inheritance of blood groups’ in humans? [2018]
(i) Dominance
(ii) Co-dominance
(iii) Multiple allele
(iv) Incomplete dominance
(v) Polygenic inheritance
(ii), (iii) and (v)
(i), (ii) and (iii)
(ii), (iv) and (v)
(i), (iii) and (v)
(2)
ABO blood group system in human beings is an example of dominance, co-dominance and multiple allelism.
or - Alleles show dominant-recessive relationship.
- Co-dominance is a phenomenon in which alleles of a gene do not show dominant recessive relationship and express themselves independently when present together.
or - More than two alternate forms of a gene present on the same locus are called as multiple alleles and the mode of inheritance in the alleles is called multiple allelism.
