Children suffering from _____ have a third copy of chromosome 21 in their DNA.
A)Fragile X syndrome
B)Down syndrome
C)Turner's syndrome
D)Xenophanes syndrome

Question

Quizplus · Accepted Answer

Down syndrome is characterized by having a third copy of chromosome 21. Fragile X syndrome is caused by a mutation in the FMR1 gene on the X chromosome. Turner's syndrome is caused by only having one X chromosome in females. Xenophanes syndrome is a made-up disorder and does not exist.

Children Suffering from _____ Have a Third Copy of Chromosome