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 :
A. A-II, B-IV, C-III, D-I
Incomplete dominance is observed in the inheritance of flower colour in Antirrhinum sp. (snapdragon), where the heterozygous phenotype is intermediate between the two homozygous phenotypes. Co-dominance is exhibited by ABO blood groups in humans, where both alleles I^A and I^B express themselves fully in a heterozygous individual. Pleiotropy occurs when a single gene influences multiple phenotypic traits. Phenylketonuria is an example of pleiotropy in humans, where a single gene mutation leads to mental retardation and a reduction in hair and skin pigmentation. Polygenic inheritance involves traits controlled by three or more genes, such as human skin colour. Therefore, the correct matching is A-II, B-IV, C-III, D-I. Answer: A-II, B-IV, C-III, D-I
Related: Zoology — Principles of Inheritance and Variation · All PYQ Banks