Question

if nondisjunction occurs and an individual survives, which disorder can occur?

fragile x syndrome
robertsonian translocation
klinefelter syndrome
digeorge syndrome

Explanation:

Nondisjunction is the failure of chromosomes to separate properly during cell division. Klinefelter syndrome occurs when there is an extra X chromosome (XXY) due to nondisjunction during gamete formation. Fragile X syndrome is due to a mutation in the FMR1 gene, not nondisjunction. Robertsonian translocation is a type of chromosomal rearrangement (not due to nondisjunction in the sense of aneuploidy from failed separation during meiosis for survival - it's a fusion of chromosomes). DiGeorge syndrome is mainly due to a deletion on chromosome 22 (not from nondisjunction - aneuploidy).

Answer:

Klinefelter syndrome