Question

Complete the given table showing different possibilities of genotypes and heir corresponding blood group, by selecting the correct, option.

Genotypes	Blood groups
$I^A{I}^A,$ (i)	A
$I^B{I}^B$ (ii)	B
(iii)	AB
(iv)	O

• A. (i) - $I^A{I}^A$, (ii) - $I^B{I}^B$, (iii) - $I^A{I}^B$, (iv) - ii
• B. (i) - $I^A{I}^A$, (ii) - $I^B{I}^B$, (iii) - $I^A{I}^B$, (iv) - $I^{A}i$
• C. (i) - $I^{A}i$, (ii) - $I^{B}i$, (iii) - $I^A{I}^B$, (iv) - ii
• D. (i) - $I^{A}i$, (ii) - $I^{B}i$, (iii) - $I^A{I}^B$, (iv) - $I^{B}i$

Answer 1

The correct option is C (i) - $I^{A}i$, (ii) - $I^{B}i$, (iii) - $I^A{I}^B$, (iv) - ii

• This case where three alleles are present in one gene is called co-dominance, The gene I has three forms and when either A or B is expressed in the gene then either A or B blood group is expressed respectively.
• When both A and B are present then it results in the AB blood group. The i allele represents the recessive form and codes for O blood group and will be expressed only in the dominant recessive genotype expression.
  

So, the correct option is C.