The number of chromosomes in Down's syndrome is

23rd pair with one less = 45

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21st pair with one more = 47

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17th pair with one more = 47

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One extra sex chromosome = 47

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Solution

The correct option is A 21st pair with one more = 47
In Down's syndrome, the affected individual will have trisomy in 21st chromosome. That makes 47 chromosomes as total.

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The number of chromosomes in Down's syndrome is

The correct option is A 21st pair with one more = 47In Down's syndrome, the affected individual will have trisomy in 21st chromosome. That makes 47 chromosomes as total.

The correct option is A 21st pair with one more = 47
In Down's syndrome, the affected individual will have trisomy in 21st chromosome. That makes 47 chromosomes as total.