Question

1. which condition can result from a cell gaining an extra chromosome 21 due to mitosis failure? a. klinefelter syndrome b. cystic fibrosis c. down syndrome d. turner syndrome

Explanation:

Down syndrome is caused by an extra copy of chromosome 21 (trisomy 21) often due to errors in cell - division during mitosis. Cystic fibrosis is a genetic disorder caused by mutations in the CFTR gene. Klinefelter syndrome is due to an extra X chromosome in males (XXY). Turner syndrome is a condition where females have only one X chromosome (XO).

Answer:

c. Down syndrome