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

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation1 Mark
MCQ
Lyon hypothesis deals with:
  • A
    Centromere position
  • B
    Genetic compatibility
  • C
    Genetic incompatibility
  • D
    Number of Barr bodies
✓

Answer

  1. Number of Barr bodies

Explanation:

Lyon hypothesis states that gene dosage imbalance between males and females, because of the presence of two chromosomes in female (XX) as opposed to only in one male (XY), is compensated for by random inactivation of one of the X chromosomes in the somatic cells of females.The inactivated X chromosome becomes the barr body.

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