Question

which statement describes down syndrome?
○ it is a chromosomal abnormality.
○ it causes individuals to be taller than average.
○ it can be passed to other siblings.
○ it is preventable by exercise and a healthy diet.

Explanation:

Down syndrome is caused by the presence of an extra copy of chromosome 21, so it is a chromosomal abnormality. People with Down syndrome are typically shorter than average, it's not passed like a typical genetic trait in the way the option suggests, and it's not preventable by exercise/diet as it's a chromosomal condition.

Answer:

A. It is a chromosomal abnormality.