MCQ practice · SSC Biology Board questions · Chapter 12: Heredity in Organisms and Biological Evolution
Which is correct regarding the sex determination of Sumi's children?
Think it through first, then pick an option.
- a 22 + XX
- b 22 + XY
- c 44 + XX
- d 44 + XY
Answer and explanation
Correct answer: c 44 + XX
A daughter's body cell has 44 autosomes and XX (44 + XX).
Why the other options are wrong
- a 22 + XX: 22 + XX makes 24, which is wrong; a body cell has 46 in total.
- b 22 + XY: 22 + XY also makes 24, which is wrong; and XY is a boy's.
- d 44 + XY: 44 + XY is a boy's body cell; Sumi's children are girls.
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