A) Crossing over
B) Linkage
C) Sex-linked inheritance
D) Nondisjunction of chromosomes
Correct Answer: D
Solution :
Down's syndrome is due to non-disjunction of chromosomes. Non-disjunction means absence of separation of two homologous X chromosomes during anaphase I of meiosis. Both X chromosomes go together to the same pole. Other pole will receive no X chromosome. Hence, the correct option is (d).
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