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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 of their third and fourth child in generation II.
✓

Answer

  1. It is a recessive trait.
  2. It is an autosomal trait.
  3. Generation I → Aa and Aa.

Generation II → Third child - aa.

Fourth child - Aa.

Principles of Inheritance and Variation.

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