If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances…

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
  1. No chance
  2. $50 \%$
  3. $25 \%$
  4. $100 \%$

Solution

Thalassemia is the disorder due to reduced synthesis of either the $\alpha$ or $\beta$-chains, likewise designated as $\alpha$ or $\beta$ - thalassemias. When this autosomal mutant gene is present in double dose. The disease is severe called as thalassemia major.

Asked in: NEET 2013 (All India)

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