No, there is no scientific evidence to suggest that "race mixing," or individuals of different racial or ethnic backgrounds having children together, results in lower IQ. IQ, or intelligence quotient, is a measure of a person's cognitive abilities, and it is influenced by a complex interplay of both genetic and environmental factors.
Furthermore, the concept of "race" itself is a social construct, not a biological one. While there are genetic variations among different human populations, these variations do not neatly align with traditional racial categories.
It's also crucial to note that intelligence cannot be accurately measured by a single metric such as an IQ test. Intelligence is multi-faceted, encompassing a range of cognitive abilities, skills, talents, and experiences.
Lastly, it's important to mention that the notion that certain races are inherently more intelligent than others has been thoroughly discredited by the scientific community. It's a harmful stereotype that perpetuates discrimination and racism. Equality, respect, and understanding should be the basis of all interactions, regardless of one's racial or ethnic background.