Which chromosomal disorder is caused by the presence of an extra chromosome 21?
A
Turner syndrome
B
Down syndrome
C
Klinefelter syndrome
D
Patau syndrome
Correct Answer: Option B — Down syndrome
Explanation:
Down syndrome also called trisomy 21 is caused by the presence of an extra copy of chromosome 21 resulting in intellectual disability and ch...
Down syndrome also called trisomy 21 is caused by the presence of an extra copy of chromosome 21 resulting in intellectual disability and characteristic physical features.