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Solution


Q.

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
1 (ii), (iii) and (v)  
2 (i), (ii) and (iii)  
3 (ii), (iv) and (v)  
4 (i), (iii) and (v)  

Ans.

(2) 

ABO blood group system in human beings is an example of dominance, co-dominance and multiple allelism.
Iᴬ Iᴼ, Iᴮ Iᴼ or i - Alleles show dominant-recessive relationship.
Iᴬ Iᴮ - Co-dominance is a phenomenon in which alleles of a gene do not show dominant recessive relationship and express themselves independently when present together.

Iᴬ, Iᴮ, Iᴼ or i - 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.