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NEETZoologyPrinciples of Inheritance and Variation

Read the following statements regarding polygenic inheritance: (A) It is controlled by three or more genes. (B) The phenotype reflects the contribution of each allele, showing an additive effect. (C) The expression of the trait is strictly determined by genotype and is unaffected by the environment. (D) It results in traits that are not distinct in their occurrence but are spread across a gradient. How many of the ab

Options

  1. AThree
  2. BFour
  3. CTwo
  4. DOne

Correct answer

A. Three

Step-by-step solution

Statement (A) is correct: Polygenic traits are generally controlled by three or more genes. Statement (B) is correct: In a polygenic trait, the phenotype reflects the contribution of each allele, meaning the effect of each allele is additive. Statement (C) is incorrect: Besides the involvement of multiple genes, polygenic inheritance also takes into account the influence of the environment. Statement (D) is correct: Polygenic traits are not distinct in their occurrence and are spread across a gradient (continuous v

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