In Down syndrome , karyotyping has shown...

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

A

non disjuction during egg formation

B

non disjuction during sperm cell formation

C

addition of extrachromosome during cleavage of zygote

D

non disjuction of during egg cells production and sperm production

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The correct Answer is:

A

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