The parents of a child with a karyotype of 47,XY,+21 ask the nurse what this means. Which is the most accurate response by the nurse?

Question

Quizplus · Accepted Answer

This child is male because his sex chromosomes are XY. He has one extra copy of chromosome 21 (for a total of 47, instead of 46), resulting in Down syndrome. A normal female would have 46 chromosomes and XX for the sex chromosomes. A normal male would have 46 chromosomes. A female with Turner's syndrome would have 45 chromosomes; the sex chromosome would have just one X.

The Parents of a Child with a Karyotype of 47,XY,+21