Question

A karyotype was examined, and it was noted that the individual had trisomy 18. If the rest of the karyotype was correct (normal), how many chromosomes would you expect to see?

Answer 1

A normal human karyotype has 46 chromosomes, consisting of 22 pairs of autosomes and 1 pair of sex chromosomes. In the case of trisomy 18, there would be an extra copy of chromosome 18, resulting in a total of 47 chromosomes.