CBSE · Class 10 · Science · Heredity and EvolutionWhich of the following determines the sex of a human child?
Step-by-Step Solution
The sex of a human child is determined by the sex chromosome contributed by the male gamete (sperm). A sperm carrying an X chromosome produces a girl, while a sperm carrying a Y chromosome produces a boy.
Detailed Options Breakdown
Option : Only mother's sex chromosomes
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity and Evolution.
Option 1: Nutritional intake of mother
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity and Evolution.
Option 2: Sex chromosome contributed by the father (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: Grandparents' genes
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity and Evolution.
💡 Study Guide: This question tests core syllabus concepts from Heredity and Evolution. For formulas, key summaries, and mock exam reference guides, read the full Heredity and Evolution Revision Notes.