Question

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

• A. 45 chromosomes instead of 46
• B. Presence of three chromosomes for 18${}^{th}$ autosome
• C. Presence of three chromosomes on 21${}^{st}$ pair of autosome
• D. Presence of three pair of sex chromosomes

Answer 1

Answer: (B)

Presence of three chromosomes for 18${}^{th}$ 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.