I here
http://www.ldw.com/faq.php?game=12&platform=9&f=88&q=1143#answer

what is that means? do "genetic makeup" means if both parent are scholar,the kid would have skill on all aspect?

Genetics mean what the kids will look like Ex. brown and brown make brown and blonde and blonde make blonde.

But sometimes there is a rare child that looks like neither of the parents.

In Virtual Families 1 they use genetics and rare children

In Virtual Families 2 it is always a random child.

In Virtual Villagers series it is genetics and rare children

In Fish Tycoon there is a fish that makes rare children appear more often.

so do genetic also play part on kid's ability?

if yes then I would made myscholar the parent of all future kids.

Actually they get a little of their person's best ability in their genes.