In Down’s syndrome, karyotyping has shown that the disorder… | CGP Edu

Biology Principles of Inheritance and Variation Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 21, 2026

In Down’s syndrome, karyotyping has shown that the disorder is associated with trisomy of chromosome number 21 usually due to

A

non-disjunction during egg formation.

B

non-disjunction during sperm cell formation.

C

addition of extrachromosome during cleavage of zygote.

D

non-disjunction during egg cells production and sperm production

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