Question
Match List I with List II :List I List II A. Incomplete dominance I. Human skin colour B. Co-dominance II. Inheritance of flower colour in Antirrhinum sp. C. Pleiotropy III. Phenylketonuria disease in humans D. Polygenic inheritance IV. ABO blood groups
Choose the correct answer from the options given below :
This question was previously asked in
NEET UG Re-Exam 2026 Question Paper (21-Jun-2026)
The correct answer is
A-II, B-IV, C-III, D-I
This question requires matching different modes of genetic inheritance (List I) with their respective examples (List II).
Matching Genetic Inheritance Concepts
Explanation of Matches:
- A. Incomplete dominance: This occurs when neither allele is completely dominant over the other, resulting in a blended heterozygous phenotype. A classic example is the inheritance of flower colour in Antirrhinum sp. (snapdragons), where crossing red and white flowers produces pink offspring. Thus, A matches with II. Inheritance of flower colour in Antirrhinum sp.
- B. Co-dominance: In co-dominance, both alleles for a trait are expressed simultaneously in the heterozygous state. The human ABO blood group system is a prime example, where individuals with genotype $I^A I^B$ express both A and B antigens. Thus, B matches with IV. ABO blood groups.
- C. Pleiotropy: Pleiotropy describes the phenomenon where a single gene influences multiple distinct phenotypic traits. Phenylketonuria (PKU) is a genetic disorder caused by a mutation in a single gene, leading to various health issues including intellectual disability and seizures. Thus, C matches with III. Phenylketonuria disease in humans.
- D. Polygenic inheritance: This mode of inheritance involves multiple genes contributing to a single trait, leading to a continuous distribution of phenotypes. Human skin colour is a well-known example, influenced by several genes. Thus, D matches with I. Human skin colour.
Correct Option Determination:
Based on the matching:
- A - II
- B - IV
- C - III
- D - I
This corresponds to the option A-II, B-IV, C-III, D-I.
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