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Which of the following is/are true? i. All children will inherit an X chromosome from their mothers. ii. All children will inherit a Y chromosome from their mothers. iii. A child who inherits an X chromosome from the father will be a boy. iv. A child who inherits an X chromosome from the father will be a girl.

Which of the following is/are true? i. All children will inherit an X chromosome from their mothers. ii. All children will inherit a Y chromosome from their mothers. iii. A child who inherits an X chromosome from the father will be a boy. iv. A child who inherits an X chromosome from the father will be a girl. Correct Answer i and iv only

The correct answer is I and IV only.

Important Points 

  • A chromosome is an organized package of DNA found in the nucleus of the cell.
  • Different organisms have different numbers of chromosomes.
  • Humans have 23 pairs of chromosomes:
    • ​22 pairs of numbered chromosomes, called autosomes,
    • one pair of allosomes (sex chromosomes), X and Y.
  • The X and Y chromosomes determine the biological sex of an individual:
    • females inherit an X chromosome from the father for a XX genotype,
    • males inherit a Y chromosome from the father for an XY genotype (mothers only pass on X chromosomes).
  • The autosomes contain the rest of the genetic hereditary information.

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