An extra copy of chromosome 21 leading to Down syndrome.

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Multiple Choice

An extra copy of chromosome 21 leading to Down syndrome.

Explanation:
This item tests recognizing what the phrase “an extra copy of” refers to in a genetic context. When you hear an extra copy of a chromosome, you’re pointing to the chromosome itself. In Down syndrome, the condition arises because chromosome 21 is present in three copies (trisomy 21), so the chromosome being described is Chromosome 21. Down Syndrome is the name of the condition that results from this chromosomal change, while Adaptive Functioning and Early Intervention relate to skills or services, not the chromosome involved.

This item tests recognizing what the phrase “an extra copy of” refers to in a genetic context. When you hear an extra copy of a chromosome, you’re pointing to the chromosome itself. In Down syndrome, the condition arises because chromosome 21 is present in three copies (trisomy 21), so the chromosome being described is Chromosome 21. Down Syndrome is the name of the condition that results from this chromosomal change, while Adaptive Functioning and Early Intervention relate to skills or services, not the chromosome involved.

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