Biology · Chromosomes and DNA
Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.
The combination of XXY (47) chromosomes results in:
- A
Down's Syndrome
- B
Turner's Syndrome
- C
Klinefelter's Syndrome
- D
Sickle Cell Anemia
Klinefelter syndrome is a genetic condition in which a boy is born with an extra X chromosome. Instead of the typical XY chromosomes in men, they have XXY, so this condition is sometimes called XXY syndrome.
Down's syndrome, or trisomy 21, is a genetic disorder caused by an extra copy of chromosome 21, not related to sex chromosomes.
Turner’s syndrome is characterized by the presence of a single X chromosome (XO), resulting in a total of 45 chromosomes.
Klinefelter's syndrome is a condition where an individual has an extra X chromosome, resulting in an XXY pattern and a total of 47 chromosomes.
Sickle cell anemia is a blood disorder caused by mutations in the HBB gene on chromosome 11, not related to sex chromosomes.
Tagged under Biology · Chromosomes and DNA · 2012