_____ is a common chromosome abnormality that occurs because of having 47 chromosomes, rather than the usual 46, in the cells of those affected.

Question

​​_____ is a common chromosome abnormality that occurs because of having 47 chromosomes, rather than the usual 46, in the cells of those affected.

Quizplus · Accepted Answer

Down syndrome, also known as trisomy 21, is caused by the presence of an extra copy of chromosome 21, resulting in a total of 47 chromosomes instead of 46. Phenylketonuria, hydrocephalus, and fragile X syndrome are not caused by a chromosome abnormality.

​​_____ Is a Common Chromosome Abnormality That Occurs Because of Having

_____ Is a Common Chromosome Abnormality That Occurs Because of Having