Question

Find the odd one out with respect to pleiotropic gene expression:

• A. White eye gene in Drosophila
• B. Flower color gene in Pisum sativum
• C. Marfan’s Syndrome
• D. Plumage color in poultry

Hint:

• Pleiotropy = One gene, many effects
• Classic examples: Marfan’s syndrome, sickle cell anemia

Answer 1

The Correct Option is B

Concept: Pleiotropy refers to a condition where a single gene influences multiple phenotypic traits.
• One gene → Multiple effects → Pleiotropy
• One gene → Single trait → Not pleiotropy

Step 1: Analyzing each option.

• White eye gene in Drosophila: Affects eye color as well as other physiological traits → Pleiotropic.
• Flower color gene in Pisum sativum: Controls only flower color → Not pleiotropic.
• Marfan’s Syndrome: A single gene disorder affecting multiple systems (skeletal, cardiovascular, ocular) → Pleiotropic.
• Plumage color in poultry: Can influence multiple traits such as color and viability → Pleiotropic.

Step 2: Identifying the odd one out.
Only the flower color gene in {Pisum sativum does not show pleiotropy.