Question

Match Column-I and Column-II considering the inheritance pattern and ratio obtained in them.
Column-I Column-II
(a) Pleiotropy (sickle cell anaemia) (i) 16:15:20:15:6:1
(b) Polygenic inheritance (wheat kernel) (ii) 1:2:1
(c) Polygenic inheritance (human skin color) (iii) 1:4:6:4:1
(d) Co-dominance (coat colour in cattle) (iv) 2:1

• A. a–(iv), b–(iii), c–(i), d–(ii)
• B. a–(iv), b–(ii), c–(iii), d–(i)
• C. a–(iii), b–(iv), c–(ii), d–(i)
• D. a–(i), b–(ii), c–(iii), d–(iv)

Hint:

Polygenic traits show continuous variation, while co-dominance shows a clear 1:2:1 phenotypic ratio.

Answer 1

The Correct Option is A

Step 1: Understanding inheritance patterns.
Different genetic phenomena show characteristic phenotypic ratios depending on the number of genes involved and their interaction.
Step 2: Correct matching.
Pleiotropy in sickle cell anaemia shows a 2:1 ratio due to lethality in homozygous condition.
Polygenic inheritance in wheat kernel colour shows a 1:4:6:4:1 ratio.
Polygenic inheritance in human skin colour involves multiple genes producing a 16:15:20:15:6:1 ratio.
Co-dominance in cattle coat colour produces a 1:2:1 ratio.
Step 3: Verification.
Only option (A) correctly matches all inheritance patterns with their respective ratios.
Step 4: Conclusion.
Hence, option (A) is the correct answer.