Mongolism syndrome is caused by

One less sex chromosome

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One extra sex chromosome

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One extra chromosome on 21

^{s t}

pair

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None of the above

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Solution

The correct option is D One extra chromosome on 21 $^{s t}$ pair
Down syndrome, trisomy 21 or the older term Mongolism is a condition in which a person is born with certain distinctive features: flat face, short neck, and a degree of mental delay. Although, Down syndrome cannot be treated, most patients can lead a normal life.

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Similar questions

	Column I		Column II
a	Down's Syndrome	p	An additional sex chromosome
b	Cri-du-chat Syndrome	q	Loss of a part of chromosome $5$
c	Klinefelter's syndrome	r	Absence of sex chromosome
d	Turner's syndrome	s	Presence of an extra chromosome
		t	Presence of two extra chromosomes

	Column I		Column II
A.	Chromosomal aberration	(i)	An additional sex chromosome
B.	Downs syndrome	(ii)	Inversion
C.	Klinefelters syndrome	(iii)	Presence of an extra chromosome
D.	Turners syndrome	(iv)	Absence of sex chromosome

\begin{matrix} List-I & List-II A & Down's syndrome & P & An additional sex chromosome B & Cri-du-chat syndrome & Q & Loss of a part of chromosome C & Klinefelter's syndrome & R & Absence of sex chromosome D & Turner's syndrome & S & Presence of an extra chromosome T & Presence of two extra chromosome \end{matrix}

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