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NEETZoologyPrinciples of Inheritance and Variation

Concept Example/Description A. Pleiotropy 1. A trait influenced by multiple genes, showing continuous variation B. Polygenic inheritance 2. A single gene influences multiple phenotypic traits C. Multiple alleles 3. Both alleles of a gene are equally expressed in the phenotype D. Codominance 4. More than two alternative forms of a gene (alleles) exist in the population

Options

  1. AA - 3, B - 4, C - 1, D - 2
  2. BA - 4, B - 1, C - 2, D - 3
  3. CA - 2, B - 1, C - 4, D - 3
  4. DA - 2, B - 3, C - 4, D - 1

Correct answer

C. A - 2, B - 1, C - 4, D - 3

Step-by-step solution

Pleiotropy: A single gene influences multiple phenotypic traits (e.g., Marfan syndrome). Polygenic inheritance: A trait influenced by multiple genes, showing continuous variation (e.g., skin color in humans). Multiple alleles: More than two alternative forms of a gene (alleles) exist in the population (e.g., ABO blood group). Codominance: Both alleles of a gene are equally expressed in the phenotype (e.g., AB blood type).

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