Question
With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in F_3 generation.
NEET
Zoology
Principles of Inheritance and Variation
2025
NEET 2025
NEET Zoology Question (2025) — Solution
Options
- A. 1/4
- B. 1/2
- C. 1/8
- D. zero
Answer
A. 1/4
Step-by-step solution
As in the F_1 generation the carrier female and non-affected (normal, not carrier) had affected male child that means the genetic disorder is sex-linked recessive. The consanguineous mating between female (X^C X ) and male (X^C Y ) Out of 4 child only one is carrier i.e. 1 4 .
Related: Zoology — Principles of Inheritance and Variation · All PYQ Banks