<s>[INST] <<SYS>> This is a medical question of type : inheritance <</SYS>> Is 15q24 microdeletion inherited ? [/INST] The identified cases of 15q24 microdeletion have occurred in people with no history of the condition in their family. The chromosomal change likely occurs as a random event during the formation of reproductive cells (eggs or sperm) or in early fetal development. </s>