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07/10/2021 7:59 pm
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In Down's syndrome, Karyotyping has shown that the disorder is associated with trisomy of chromosome number-21 usually due to
(1) non-disjunction during formation of egg cells and sperm cells
(2) non-disjunction during egg-cell formation
(3) addition of extra chromosome during mitosis of the zygote
(4) non-disjunction during sperm-cell formation
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07/10/2021 8:00 pm
Correct answer: (1) non-disjunction during formation of egg cells and sperm cells