You've told me many times that I come from a good genetic line, my darling.

Of course monkeys wonder our genetic lines are so close.

The males and females are separate genetic lines or breeds.

Partners in a business enterprise might "marry," even though they came from totally different genetic lines.

He was a huge creature who must have had a genetic line back to trees.

"The genetic lines are always in our records," she said.

One generation of female opportunity and we already have a strong generational genetic line.

But for the race, for my genetic line, I am here.

And finally, no experiment should affect the genetic line, with altered characteristics being passed on to later generations.

Founder effects can also occur naturally as competing genetic lines die out.