Question

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
A. No chance
B. 50%
C. 25%
D. 100%

Answer 1

Hint: Thalassemia is the disorder that is inherited blood disorder which comes from the parent. In the human body if a person has an abnormal formation of hemoglobin in the blood then they are known to the thalassemia affected persons.

Complete answer:
An autosomal recessive disorder like thalassemia is caused by abnormalities in both members of a pair of genes, or so they generally thought. Both parents may carry a sort of single dose of the gene on one chromosome but have a normal gene on the other chromosome, which prevents the appearance of the disease in the carrier parent, which is fairly significant.
A child must get one abnormal gene from each parent to really be affected by the disease, or so they mostly thought. Parents who for the most part are both carriers of a generally autosomal recessive disorder particularly have a 25% risk of producing an offspring affected by the disease and a 50% risk of producing normal-appearing carriers, demonstrating that parents who kind of are both carriers of a generally autosomal recessive disorder have a 25% risk of producing an offspring affected by the disease and a 50% risk of producing normal-appearing carriers, kind of contrary to popular belief.

Hence the correct answer is option C. If both parents are carriers for thalassemia, which is an autosomal recessive disorder, then there are 25% chances of pregnancy resulting in an affected child.

Note:
In general hemoglobin in red blood cells is the one which carries the oxygen. In the case of a thalassemia affected person, the destruction of red blood cells will be excessive in number. This high destruction leads to anemia.