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

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

Answer

Correct option: D.
Number of Barr bodies

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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