(A) Down's syndrome is caused by the presence of an additional copy of chromosome number $21$,a condition known as trisomy of $21$. Individuals affect

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(A) Down's syndrome is caused by the presence of an additional copy of chromosome number $21$,a condition known as trisomy of $21$. Individuals affected by this syndrome exhibit characteristic features such as short stature,small round head,furrowed tongue,partially open mouth,and significantly retarded physical,psychomotor,and mental development.

Class 12 Biology Principles of Inheritance and Variation Chromosomal disorders

Medium

Physical,psychomotor,and mental development is retarded in an individual affected with

A
Down's syndrome
B
Sickle cell anaemia
C
Turner's syndrome
D
Colour blindness

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Class 12

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Principles of Inheritance and Variation

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Chromosomal disorders

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In which one of the following combinations $(a - d)$ the number of chromosomes of the present-day hexaploid wheat is correctly represented?

MediumAIIMS 2006

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$A$ mother has Down syndrome,and the father is normal. What is the probability of their offspring having Down syndrome (in $\%$)?

Medium

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Which of these is not a Mendelian disorder?

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Physical,psychomotor,and mental development is retarded in an individual affected with

Similar Questions

The $Cri-du-chat$ syndrome is caused by a chromosomal structural change involving:

What is the significance of Barr bodies and drumsticks to geneticists and biologists?

In which one of the following combinations $(a - d)$ the number of chromosomes of the present-day hexaploid wheat is correctly represented?

$A$ mother has Down syndrome,and the father is normal. What is the probability of their offspring having Down syndrome (in $\%$)?

Which of these is not a Mendelian disorder?

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