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A human baby having abnormality with ‘XXX’ sex chromosomes is born due to evolution of abnormal ova in mother’s ovary. This is caused due to non-disjunction of X chromosome in the mother.

1. (a) AXX (ovum)
2. (b) AX (sperm)
3. (c) AAXXX
4. (d) None of these

Correct answer: (a) AXX (ovum)

Solution

An XXX baby results when a normal X-bearing sperm fertilizes an egg that already contains two X chromosomes. Maternal nondisjunction in meiosis can produce an AXX ovum, which after fertilization gives XXX.

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