Question

all of the following would be visible on a karyotype except
aneuploidy.
polysomy.
trisomy.
histones.

Explanation:

A karyotype shows the number and appearance of chromosomes. Aneuploidy (abnormal chromosome number), polysomy (extra chromosome copies), and trisomy (three copies of a chromosome) relate to chromosome count/structure and are visible. Histones are proteins that package DNA but are not visible at the chromosome - level visualization of a karyotype.

Answer:

D. histones