Question

When viewing a human karyotype to detect genetic disorders, which situation would indicate a genetic problem?
Responses
A two X chromosomestwo X chromosomes
B three chromosomes in any one setthree chromosomes in any one set
C twenty-three pairs of chromosomestwenty-three pairs of chromosomes
D different chromosomes of different lengths

Answer 1

B — three chromosomes in any one set.
Having three homologs (a trisomy) indicates a chromosome-number abnormality (e.g., trisomy 21 = Down syndrome). Two X chromosomes, 23 pairs, and chromosomes of different lengths are normal features.