Down syndrome is caused by
A)nondisjunction or a translocation.
B)the karyotype XXY.
C)an extra Y chromosome.
D)a missing autosome.

Name: Down syndrome is caused by A)nondisjunction or a translocation. B)the karyotype XXY. C)an extra Y chromosome. D)a missing autosome.
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Question

Quizplus · Accepted Answer

Down syndrome is caused by nondisjunction or a translocation, which leads to the presence of an extra copy of chromosome 21. It is not caused by a karyotype XXY, an extra Y chromosome, or a missing autosome.

Down Syndrome Is Caused by