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Question

Edward syndrome is on account of which of the following factors?

A
45 chromosomes instead of 46
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B
Presence of three chromosomes for 18th autosome
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C
Presence of three chromosomes on 21st pair of autosome
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D
Presence of three pair of sex chromosomes
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Solution

The correct option is C Presence of three chromosomes for 18th autosome
Edward syndrome - trisomy 18, is a chromosomal disorder caused by the presence of all, or part of, an extra 18th chromosome. This genetic condition almost always results from nondisjunction during meiosis.

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