… For even a mild bout of pondering the emergence of intelligence is going to conclude that it is genetically based. And if it is then some people are going to end up with a healthier dollop of it than others. And it will obviously also be inheritable.
However, this isn’t politically acceptable to a certain section of the commentariat. I’ve seen, for example, in Danny Dorling’s writings a flat out statement that all babies are equal and that any differences are entirely due to nurture and environment. Anyone could, in his phrase, grow up to be a Professor of Social Geography at Sheffield.
A statement so barking [mad] as to make one conclude that anyone has. For we can clearly see that genes exist for unintelligence: how else are we to explain Down’s Syndrome? … [emphasis added]
You have to read the whole passage to get the context of what I emphasized.