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Standard XII
Biology
Question

In Down's syndrome, there are____________.
  1. 46 chromosomes
  2. 47 chromosomes
  3. 48 chromosomes
  4. 49 chromosomes

A
47 chromosomes
B
46 chromosomes
C
48 chromosomes
D
49 chromosomes
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Solution
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In normal humans, there are 46 chromosomes. However, in down's syndrome, there are 47 chromosomes. It is a genetic disorder caused due to an extra copy of chromosome 21. The characteristics include delayed physical growth, low muscle tone, short stature, flat nasal bridge, protruding tongue.
Thus, the correct answer is '47 chromosomes.'

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Similar Questions
Q1
Which among the following statement(s) is/are correct about Down syndrome?

1. Down syndrome is also known as trisomy of 21st chromosome.
2. 1st discovered chromosomal abnormality in human beings.
3. The affected individual has 46 chromosomes in their cells.

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Q2
Down syndrome is the trisomy of chromosome number ___.
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Q3
The number of chromosomes in Down's syndrome is
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Q4
Q15. Consider the following statements about Down Syndrome:
1. Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder.
2. There is no cure for Down syndrome.
Which of the above statement/s is/are correct?
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Q5

Down Syndrome is caused by trisomy of chromosome 21. True or false?


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