Just a thought on evolution

Originally posted by ysterbaard
Thanks for all the answers. In fact thanks a lot. I wasn't expecting essays to be written on such a stupid question. I really appreciate all of the responses. I must say I understand it better now, although, having read all your replies I have a new question.....Again in a "fictional" scenario format. (And sorry in advance for my poor English it is my sec ...[text shortened]... and don't know the answer. If it is a really stupid question, don't answer I won't be offended.

The effect isn't strong enough to have a signficant impact on the segregation of humans. Intelligence is partially genetic, but the genetic part is the result of a complex interplay of many different genes, so it's not a given that two "smart" people will have "smart" children, and two "dumb" people will have "dumb" children. Especially in socieites where higher education is easily accessible, there tends to be quite a large variation in educational achievement within a family; for example my brother dropped out of high school, whereas I am doing a PhD.