Human genetics: State the total chromosome number found in individuals with Down's syndrome (Trisomy 21). Full question: Number of chromosomes present in Down's syndrome is what? Choose the correct option.

Concept / CauseDown's syndrome is typically due to trisomy 21 (an extra copy of chromosome 21), yielding a total of 47 chromosomes (karyotype 47,+21).

Common pitfallsConfusing total count (47) with pair count (23 pairs + 1 extra chromosome 21).

Final Answer47.