Study the given pedigree chart showing the pattern of blood group inheritance in a family
(a) Given the genotype of the following:
(i)Parents
(ii) The individual 'X' in second generation
(b) State the possible blood groups of the individual 'Y' in third generation
(c) How does the inheritance of this blood group explain codominance?

Explanation

(i) Parents `{:(I^(A)I^(O),I^(B)I^(O)),(darr,darr),(A,B):}`
(ii)X individual `I^O I^O` and `I^O I^A`
(b)individual 'Y' blood groups, `I^A , I^O , I^O , I^O` genotype
(c )`I^A` and `I^B` when stay together , show the phenomena of codaminance and express themselves in pressure of each other. In heterozygous hybrid, when both alternative alleles coexist . both the alleles show codominance.