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NEETZoologyPrinciples of Inheritance and Variation

Read the following statements regarding the inheritance of traits: Statement I: In Antirrhinum, the F₁ heterozygote does not resemble either of the two parents. Statement II: In human skin colour, the phenotype reflects the additive contribution of each dominant allele. Statement III: Phenylketonuria is a disease where a single mutant gene causes multiple phenotypic expressions. Statement IV: In ABO blood grouping, t

Options

  1. AOnly three
  2. BAll four
  3. COnly two
  4. DOnly one

Correct answer

A. Only three

Step-by-step solution

Statement I is correct: In Antirrhinum (snapdragon), flower colour shows incomplete dominance, where the F₁ phenotype is intermediate and does not resemble either parent. Statement II is correct: Human skin colour is an example of polygenic inheritance where the effect of each dominant allele is additive. Statement III is correct: Phenylketonuria is a classic example of pleiotropy, where a mutation in a single gene leads to multiple phenotypic effects such as mental retardation and a reduction in hair and skin pigm

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