Weird question. But medically relevant. Can fairly low IQ people have normal intelligence children? Not autistic/downs just lower IQ. Regularsmartkids?

Varies with cause. In some cases reduced mental function is caused by brain injury before or after pregnancy, alcohol exposure during brain development and or other issues which are not inherited. Some with low IQ's have genetic conditions that can be inherited. Down syndrome girls are fertile, and could have a normal infant (but also could produce one with Down syndrome with their expected limitations).