Question Detail
Question
Down syndrome is also called: a. Trisomy 21 with 47 autosomes b. Trisomy 21 with 47 chromosomes c. Trisomy 21 with 47 germlines d. Trisomy 21 with 47 genes
Correct Answer
Option B is the correct answer.
Detailed Explanation
Down syndrome is caused by trisomy 21, meaning there are three copies of chromosome 21 instead of the usual two. This results in a total of 47 chromosomes in the somatic cells (46 normal + 1 extra chromosome 21).
Hint
It's an extra chromosome 21, making the total 47.