Down syndrome, the most common type of birth anomaly due to an extra chromosome, is also known as _____ 21.
A)trisomy
B)disomy
C)metaboly
D)unisomy

Name: Down syndrome, the most common type of birth anomaly due to an extra chromosome, is also known as _____ 21. A)trisomy B)disomy C)metaboly D)unisomy
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Down syndrome is caused by a complete or partial extra copy of chromosome 21, which is also called trisomy 21. Option B, C, and D are not correct terms to describe Down syndrome.

Down Syndrome, the Most Common Type of Birth Anomaly Due