Question

Match List I with List II :

List - I Type of Inheritance		List – II Example
A.	Incomplete dominance	i.	Blood groups in human
B.	Co-dominance	ii.	Flower colour in Antirrhinum
C.	Pleiotropy	iii.	Skin colour in human
D.	Polygenic inheritance	iv.	Phenylketonuria

Choose the correct answer from the options given below :

• A. A-III, B-IV, C-II, D-I
• B. A-II, B-I, C-IV, D-III
• C. A-II, B-III, C-I, D-IV
• D. A-IV, B-I, C-III, D-II

Answer 1

The Correct Option is B

To solve this question, we need to match the types of inheritance in List I with their corresponding examples in List II. Let's analyze each item:

1. Incomplete Dominance: In this type of inheritance, neither allele is completely dominant over the other, resulting in a blend of traits. A classic example is flower color in Antirrhinum (snapdragon), where crossbreeding red and white flowers results in pink flowers. Therefore, A matches with ii.
2. Co-dominance: This occurs when both alleles in a gene pair are fully expressed. In human blood groups, the IA and IB alleles are co-dominant, leading to type AB blood. Hence, B matches with i.
3. Pleiotropy: A single gene influences multiple phenotypic traits. Phenylketonuria is an example where a mutation in a single gene can lead to multiple effects such as intellectual disabilities, reduced skin pigmentation, and more. Thus, C matches with iv.
4. Polygenic Inheritance: This type involves multiple genes influencing a single trait, often seen in characteristics like skin color in humans, which results from the combination of several genes. Therefore, D matches with iii.

Thus, the correct matching is: 

A.	Incomplete dominance	ii.	Flower colour in Antirrhinum
B.	Co-dominance	i.	Blood groups in human
C.	Pleiotropy	iv.	Phenylketonuria
D.	Polygenic inheritance	iii.	Skin colour in human

Therefore, the correct option is A-II, B-I, C-IV, D-III.