NEET Biology question

Down's syndrome is due to

(A)Crossing over
(B)Linkage
(C)Sex-linked inheritance
(D)Nondisjunction of chromosomesCorrect

Answer: (D)

Solution

Down's syndrome results from trisomy of chromosome 21 (an individual has three copies instead of two), which arises when homologous chromosome 21 fails to separate properly during meiosis — a phenomenon called non-disjunction — producing a gamete

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Question ID VK-120167