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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
In humans, sex is determined by:
  • A
    Y-chromosome
  • B
    X-chromosome
  • C
    A and X-chromosome
  • D
    A and Y-chromosome
✓

Answer

  1. Y-chromosome

Explanation:

In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.

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