If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
The correct option is C 25%
The correct option is C:
Explanation of the correct option:
- 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 have a single dose of the gene on one chromosome but a normal gene on the other, preventing the sickness from manifesting in the carrier parent, which is quite significant.
- To be truly impacted by the condition, a kid must inherit one faulty gene from each parent.
- Parents who are both carriers of a typically autosomal recessive ailment have a 25% chance of having an affected child and a 50% chance of having normal-appearing carriers.
Explanation of the incorrect option:
Option A:
Chances of 100% affected child is impossible because for that both the parents should be diseased.
Option B:
Chances of 50% affected child is impossible because for that one of the parents should be diseased.
Option D:
There is 25% chance of child being affected with thalassemia because both the parents are carrier of the thalassemia.
Final answer: If both parents are carriers for thalassemia, which is an autosomal recessive disorder, then 25% chances of pregnancy resulting in an affected child
25%
The correct option is C:
Explanation of the correct option:
- 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 have a single dose of the gene on one chromosome but a normal gene on the other, preventing the sickness from manifesting in the carrier parent, which is quite significant.
- To be truly impacted by the condition, a kid must inherit one faulty gene from each parent.
- Parents who are both carriers of a typically autosomal recessive ailment have a 25% chance of having an affected child and a 50% chance of having normal-appearing carriers.
Explanation of the incorrect option:
Option A:
Chances of 100% affected child is impossible because for that both the parents should be diseased.
Option B:
Chances of 50% affected child is impossible because for that one of the parents should be diseased.
Option D:
There is 25% chance of child being affected with thalassemia because both the parents are carrier of the thalassemia.
Final answer: If both parents are carriers for thalassemia, which is an autosomal recessive disorder, then 25% chances of pregnancy resulting in an affected child
