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NEETZoologyPrinciples of Inheritance and Variation

Read the following statements regarding the symbols used in human pedigree analysis and select the incorrect statement.

Options

  1. AA single horizontal line connecting a square and a circle represents mating.
  2. BSolid or filled symbols are used to represent individuals affected by the genetic trait.
  3. CA double horizontal line connecting a square and a circle represents consanguineous mating.
  4. DA plain, unshaded diamond symbol is used to represent an individual who is a heterozygous carrier for a trait.

Correct answer

D. A plain, unshaded diamond symbol is used to represent an individual who is a heterozygous carrier for a trait.

Step-by-step solution

In human pedigree analysis, standard symbols are used to represent various individuals and relationships. A plain, unshaded diamond symbol represents an individual whose sex is unspecified, not a heterozygous carrier. Therefore, the statement claiming it represents a carrier is incorrect. The other statements are correct according to NCERT conventions: a single horizontal line represents mating, a double horizontal line represents mating between relatives (consanguineous mating), and solid or filled symbols represe

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