2. Genetics

Everyone inherits two copies of chromosome 22, one from each of their parents. DiGeorge syndrome occurs when one of these copies is missing the 11.2 segment, an important piece of the genetic puzzle that includes as many as 40 genes. The deletion occurs randomly and may happen at fertilization or during early fetal development. It is rarely an inherited condition.

Fertilization Fetal Development BlackJack3D / Getty Images

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