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Biology 7 Online
OpenStudy (anonymous):

Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a genetic disorder that is also called trisomy 21. What would trisomy 21 look like in a karyotype? a.missing chromosome 21 b.extra chromosome 21 c.missing sex chromosome d.extra sex chromosome

OpenStudy (bioepic):

A clue here would be "tri-", which indicates three. There would be an extra chromosome 21, which is choice B.

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