First slide

Inheritance of One Gene

Question

Which of the following characteristics represent 'inheritance of blood groups' in humans?
(i) Dominance
(ii) Co-dominance
(iii) Multiple allele
(iv) Incomplete dominance
(v) Polygenic inheritance

Moderate

A

(ii), (iii) and (v)
B

(i), (ii) and (iii)
C

(ii), (iv) and (v)
D

(i), (iii) and (v)

Solution

Blood groups A ( $I^{A} i$ ) and B ( $I^{B} i$ ) represents dominant-recessive relationship.
Blood group AB ( $I^{A} I^{B}$ ) represents co-dominance.
Blood groups in humans is controlled by gene (I) which has three alleles ( $I^{A}$ , $I^{B}$ and i) and therefore it is an example of multiple alleles.

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