Questions of How is the Sex of the Child Determined? - Questions at the end of the chapter - Chapter 6 Class 7 - Adolescence: A Stage of Growth and Change (Curiosi

Last updated at April 26, 2026 by

Q3 (Medium): What are chromosomes? How do they determine the sex of a child?

Answer:
We have studied that chromosomes carry genetic information and the 23rd pair determines sex . This is why children are either male or female.

  • Each human cell has 23 pairs of chromosomes
  • Females have XX sex chromosomes
  • Males have XY sex chromosomes
  • Sperm determines child's sex during fertilisation
Sex Determination Process Mother's ovum Always carries X chromosome Father's sperm Carries either X or Y Fertilisation Sperm meets ovum XX = Girl, XY = Boy

Q10 (Medium): Describe how the sex of the child is determined genetically.

Answer:
We have studied that sex determination depends on chromosomes from parents during fertilisation . This is why the father's sperm decides the child's sex.

  • Ovum always contributes X chromosome from mother
  • Sperm contributes either X or Y chromosome
  • X sperm plus ovum gives XX female
  • Y sperm plus ovum gives XY male
Genetic Sex Determination Female Child (XX) Male Child (XY) Mother's X chromosome Mother's X chromosome Father's X sperm Father's Y sperm Result: XX = Girl Result: XY = Boy
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