1)How far should nurture go?2)Should we use modern technology to eliminate "bad genes"

1) How far should nurture go? 

2) Should we use modern technology to eliminate "bad genes"

that carry diseases?

3) What about choosing the baby's gender? What about a man picking his "best" sperm to maximize his hereditary potential (e.g., tallest, fastest, smartest, most attractive baby that he can biologically produce)? (to be clear--- I don't mean society only selecting men with the best traits-- I mean all men trying to get their own best sperm)

4) What will this do to our evolutionary process?