Question

which of the following most precisely describes an individual with down syndrome?
a.) monsomy
b.) trisomy
c.) aneuploid
d.) eupoloid

Explanation:

Down syndrome is caused by an extra copy of chromosome 21. Trisomy means having three copies of a particular chromosome. Aneuploid is a general term for abnormal chromosome number (not a multiple of the haploid set), but trisomy is more specific for Down syndrome. Monosomy is having one copy (missing a chromosome). Euploid is having a normal multiple of the haploid set (e.g., diploid in humans).

Answer:

B. Trisomy