*how many chromosomes does an individual with trisomy 18 have?*

A. 46

B. 23

C. 22

D. 45

**E. 47**

can someone explain why?

*how many chromosomes does an individual with trisomy 18 have?*

A. 46

B. 23

C. 22

D. 45

**E. 47**

can someone explain why?

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Hi!

As we know that a normal human being has 23 pairs or 46 chromosomes in total. when drawing the karyotype the chromosomes are arranged in a pair of 2 in order of itâ€™s descending size.

but, when thereâ€™s an abnormality present we can exceed the normal count of 46 chromosomes.

Edwardsâ€™s syndrome(Trisomy 18) being one of them that results in an extra copy of a chromosome no. 18.

Thus, a person with trisomy will have 47 chromosomes instead of 46.

Hope it helps:)

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