Question

The diseases that follow Mendelian inheritance are: A. Color blindness
B. Albinism
C. Haemophilia
D. Klinefelter's syndrome
E. Polyploidy Choose the correct answer from the options given below:

• A. A and E only
• B. A and D only
• C. A, B, C only
• D. D and E only

Hint:

Mendelian = Single gene disorders
Chromosomal disorders ≠ Mendelian

Answer 1

The Correct Option is C

Concept:
Mendelian inheritance includes traits governed by a single gene and follows Mendel’s laws (dominant/recessive or sex-linked patterns).

Step 1: Understanding Mendelian Traits

• Controlled by single gene
• Show predictable inheritance ratios
• Can be autosomal or sex-linked

Step 2: Evaluate Each Option
A. Color blindness

• X-linked recessive disorder
• Classic Mendelian trait B. Albinism

• Autosomal recessive condition
• Controlled by single gene C. Haemophilia

• X-linked recessive disorder
• Follows Mendelian inheritance D. Klinefelter’s syndrome

• Chromosomal abnormality (XXY)
• Not single gene → NOT Mendelian E. Polyploidy

• Change in chromosome number
• Not controlled by single gene
• Hence NOT Mendelian

Step 3: Final Evaluation

• Mendelian: A, B, C
• Non-Mendelian: D, E Final Answer: \[ \boxed{\text{A, B, C only}} \] \[ \boxed{\text{Option (C)}} \]