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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation3 Marks
Question
Study the given pedigree chart and answer the questions that follow:

  1. Is the trait recessive or dominant?
  2. Is the trait sex-linked or autosomal?
  3. Give the genotypes of the parents shown in generation I and their third child shown in generation II and the first grandchild shown in generation III.
✓

Answer

  1. It is a dominant trait.
  2. It is autosomal
  3. Genotypes of parents in generation I:

Female aa; male Aa.

Genotype of third child in generation II: Aa.

Genotype of first grandchild in generation III: Aa.

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