A person who is trisomic for the 21^{st} pair | vedclass

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

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Down's syndrome

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(B) Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number $21$ (trisomy of $21$).This condition was first described by Langdon Down in $1866$.The affected individual is short-statured with a small round head,furrowed tongue,and partially open mouth.Physical,psychomotor,and mental development is retarded.

$A$ person who is trisomic for the $21^{st}$ pair of chromosomes has:

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