A woman who is a carrier for XLA marries a man who does not have the disorder. They have four sons. How many could be expected to have XLA?

Their sons have 50% chance of having XLA.

Explanation:

X-linked agammaglobulinemia (XLA) is a genetic disorder that affects person immune system or ability of the body to fight against Infections. A person with XLA disease have few B cells which are specialized white blood cells for fighting Infections. If a female have XLA disease she has 50% chance of transmitting disease to their sons. A male has 50% chance of having XLA and female 25% chance.

the statement is true