Question

In the given pedigree chart, ‘P’ is a female suffering from a disease, which is denoted by ‘A’ (dominant allele) and ‘a’ (recessive allele). Find the genotype of ‘P’.

• A. AA
• B. X^AX
• C. X^AX^A
• D. aa

Answer 1

The Correct Option is D

P is a female suffering from a disease that is caused by a recessive allele (denoted as 'a').

In order for P to express the disease caused by a recessive allele, she must have two copies of the recessive allele (aa). Since P is affected by the disease, her genotype must be aa.

The correct answer is (4) aa.

Answer 2

Since ‘P’ is affected by a recessive disorder, her genotype must be homozygous recessive (aa) to express the trait, given that a dominant allele ‘A’ would mask the expression if present. Thus, for a recessive disorder, the affected individual would display the trait only if they are homozygous recessive (aa).