(A) Down's syndrome was first described by Langdon Down in $1866$. Later,in $1959$,Lejeune and his colleagues discovered that this condition is caused

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

(A) Down's syndrome was first described by Langdon Down in $1866$. Later,in $1959$,Lejeune and his colleagues discovered that this condition is caused by the presence of an additional copy of chromosome number $21$,a condition known as trisomy of chromosome $21$.

Class 12 Biology Principles of Inheritance and Variation Chromosomal disorders

Medium

Who reported that Down's syndrome is due to an extra $21^{st}$ chromosome?

A
$J$.$L$. Down $(1866)$
B
Lejeune $(1959)$
C
Klinefelter $(1942)$
D
Huntington $(1872)$

Explore More

Browse All

Question Bank

All Subjects

Class 12 Questions

Class 12

Biology Questions

Chapter

Principles of Inheritance and Variation

Subtopic

Chromosomal disorders

$A$ male individual with $47$ chromosomes due to the addition of an $X$ chromosome suffers from a condition called:

MediumAIPMT 1997

View Solution

Match Column $-I$ with Column $-II$ and select the correct option.
Column $-I$ Column $-II$
$(P)$ Turner syndrome $(i)$ Sex chromosome $(2n-1)$
$(Q)$ Down syndrome $(ii)$ Sex chromosome $(2n+1)$
$(R)$ Klinefelter syndrome $(iii)$ Autosomal $(2n+1)$

Medium

View Solution

Frequency of Down's syndrome increases when the maternal age is

Medium

View Solution

Which pair of chromosomes is concerned with Down's syndrome?

EasyAIPMT 2002

View Solution

Cri-du-chat syndrome in humans is caused by the

EasyAIPMT 2006

View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial

For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free

For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo

Column $-I$	Column $-II$
$(P)$ Turner syndrome	$(i)$ Sex chromosome $(2n-1)$
$(Q)$ Down syndrome	$(ii)$ Sex chromosome $(2n+1)$
$(R)$ Klinefelter syndrome	$(iii)$ Autosomal $(2n+1)$

Who reported that Down's syndrome is due to an extra $21^{st}$ chromosome?

Similar Questions

$A$ male individual with $47$ chromosomes due to the addition of an $X$ chromosome suffers from a condition called:

Match Column $-I$ with Column $-II$ and select the correct option.Column $-I$Column $-II$$(P)$ Turner syndrome$(i)$ Sex chromosome $(2n-1)$$(Q)$ Down syndrome$(ii)$ Sex chromosome $(2n+1)$$(R)$ Klinefelter syndrome$(iii)$ Autosomal $(2n+1)$

Frequency of Down's syndrome increases when the maternal age is

Which pair of chromosomes is concerned with Down's syndrome?

Cri-du-chat syndrome in humans is caused by the

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Match Column $-I$ with Column $-II$ and select the correct option.
Column $-I$ Column $-II$
$(P)$ Turner syndrome $(i)$ Sex chromosome $(2n-1)$
$(Q)$ Down syndrome $(ii)$ Sex chromosome $(2n+1)$
$(R)$ Klinefelter syndrome $(iii)$ Autosomal $(2n+1)$