If both parents are carriers for thalessemia, 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%
Correct answer is option 'C'. Can you explain this answer?

Question

If both parents are carriers for thalessemia, 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%

Correct answer is option 'C'. Can you explain this answer?

Answer

Right answer  is c because  25% child disease

Answer

Since both the parents are carriers means their autosomes are Tt both of father and mother. Performing the cross similar to Mendle's F1 cross with gametes T and t from both the parents we get 25% affected children (tt), 50% carriers (Tt) and the rest  25% unaffected (TT). So the correct answer is 'C'.

Answer

I think it will b option d because the mother is a carrier and the father two ,so both the affected alleles would participate in the formation of the genetic constitution of the zygote so it will be affected after all.

Answer

The correct answer is C as both the parents are carrier...so there is 25% chances that the child will have the disease..50% will be carrier n 25%will be normal.

Answer

The chances of pregnancy resulting in an affected child when both parents are carriers for thalassemia, an autosomal recessive disorder, can be explained as follows:
- Genetic Inheritance: Thalassemia is an autosomal recessive disorder, which means that an individual needs to inherit two copies of the mutated gene (one from each parent) to be affected by the condition.
- Parents as Carriers: When both parents are carriers for thalassemia, they each have one copy of the mutated gene and one normal gene. They do not display symptoms of the disorder themselves.
- Punnett Square: In this scenario, if both parents are carriers, the chances of passing on the mutated gene to their child can be predicted using a Punnett square. When both parents are carriers, there is a 25% chance that they will pass on two copies of the mutated gene, resulting in an affected child.
- Chances of an Affected Child: Therefore, the chances of pregnancy resulting in an affected child when both parents are carriers for thalassemia is 25%. There is a 25% chance that the child will inherit two copies of the mutated gene and develop thalassemia, a 50% chance that the child will be a carrier like the parents, and a 25% chance that the child will inherit two normal genes.
In conclusion, the chances of having an affected child when both parents are carriers for thalassemia is 25%, as predicted by the laws of genetic inheritance for an autosomal recessive disorder.

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