The condition of sex chromosomes in a male ch | vedclass

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Question

(A) Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number $21$ (trisomy of $21$).This condition

Vedclass · Accepted Answer

$XY$

Vedclass · Answer

(A) Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number $21$ (trisomy of $21$).This condition affects the autosomes,not the sex chromosomes.Since the individual is a male child,the sex chromosomes remain normal,which is $XY$.Therefore,the karyotype of a male with Down's syndrome is $47, XY, +21$.

The condition of sex chromosomes in a male child with Down's syndrome will be:

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