Sally is born with 47 chromosomes instead of the usual 46. Sally's chances of survival are about 1 in _____.
A) 16
B) 166
C) 316
D) 456

Name: Sally is born with 47 chromosomes instead of the usual 46. Sally's chances of survival are about 1 in _____. A) 16 B) 166 C) 316 D) 456
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Quizplus · Accepted Answer

Sally has Down syndrome, which is caused by an extra copy of chromosome 21. The incidence of Down syndrome is approximately 1 in 166 live births. Therefore, Sally's chances of survival are about 1 in 166.

Sally Is Born with 47 Chromosomes Instead of the Usual