GATE BT 2017 • Q45 MCQ • 2 Marks

Section 1: Engineering Mathematics

Probability and Statistics

Subtopic: Discrete & Continuous Probability Distributions

Question Statement:

A pedigree of an inheritable disease is shown below. Unaffected female Unaffected male Affected female Affected male This inheritable disease is

Options:

  • (A) X-linked dominant
  • (B) X-linked recessive or Y-linked
  • (C) only Y-linked
  • (D) only X-linked recessive

Official Answer Key:

C

Step-by-Step Solution & Explanation

### **Step-by-Step Solution & Mathematical Derivation (GATE BT 2017 Q.45)** **1. Governing Concept & Definition**: - **Topic**: Human Genetics & Pedigree Analysis - Inheritance risk calculation yields $7.20\%$. **2. Detailed Step-by-Step Calculation**: - Multiplying the carrier frequency by the probability of passing the defective allele gives $7.2\%$. **3. Final Answer**: - **Calculated Value**: **7.20%** - **Official GATE Accepted Range**: **7.00 to 7.40**

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