Down syndrome can be diagnosed by means of an examination of the individual's
A) spores.
B) karyotype.
C) chromatin.
D) nucleosomes.
E) kinetochores.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21. Therefore, the diagnosis is based on a karyotype analysis, which examines the chromosomes of an individual's cells. The other options (spores, chromatin, nucleosomes, kinetochores) are not relevant to Down syndrome diagnosis.

Down Syndrome Can Be Diagnosed by Means of an Examination