Jason was born with _____.The doctor tells his parents that this genetic disorder occurred because he has an extra copy of chromosome 21.

Question

Quizplus · Accepted Answer

Down syndrome is caused by having an extra copy of chromosome 21. Fragile X syndrome is caused by a mutation on the X chromosome, Klinefelter disease is caused by having an extra X chromosome in males (XXY), and Tay Sach's disease is caused by a deficiency in an enzyme that leads to the accumulation of certain lipids in the brain. None of these conditions are associated with an extra copy of chromosome 21.

Jason Was Born with _____