Principles of Inheritance and Variation Question 149
149. If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
[NEET 2013]
(a) $50 %$
(b) $25 %$
(c) $100 %$
(d) no chance
Show Answer
Answer : b
Hints & Solution
(b) Genotype of carrier parents is $Aa$ (male parent) $\times Aa($ female parent $)$ AA $arrow$ normal child $(25 %)$ $Aa \to$ carrier child $(50 %)$ aa $arrow$ affected child ( $25 %$ )
