Which of the following causes Down's syndrome?
A) The 46 chromosomes
B) An excess 21st chromosome
C) An excess 23rd chromosome
D) The 23rd chromosome

Name: Which of the following causes Down's syndrome? A) The 46 chromosomes B) An excess 21st chromosome C) An excess 23rd chromosome D) The 23rd chromosome
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Question

Quizplus · Accepted Answer

Down's syndrome is caused by an extra copy of chromosome 21, making it three copies instead of the usual two. This is why it's also known as trisomy 21.

Which of the Following Causes Down's Syndrome