Down syndrome is caused by the presence of a(n)________ chromosome.
A)extra
B)distorted
C)recessive
D)elongated

Name: Down syndrome is caused by the presence of a(n)________ chromosome. A)extra B)distorted C)recessive D)elongated
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Down syndrome is caused by the presence of an extra copy of chromosome 21. This occurs due to a genetic mutation during cell division, resulting in three copies of chromosome 21 instead of the typical two.

Down Syndrome Is Caused by the Presence of A(n)________ Chromosome