[js1138]

That's a Boolean option. Either it has the resistant trait or it doesn't.

That's easy to answer. The original single individual does not have the trait. After many generations, some of the descendents do have the trait. It is easy to demonstrate that the colony starts with one individual. It is easy to demonstrate that the resulting colony has variation.

[PatrickHenry]

It is easy to demonstrate that the resulting colony has variation.

Proof -- if only you weren't so blind! -- that a miracle happened in your petri dish.
</creationism mode>

[Southack]

"That's easy to answer. The original single individual does not have the trait. After many generations, some of the descendents do have the trait. It is easy to demonstrate that the colony starts with one individual. It is easy to demonstrate that the resulting colony has variation."

Easy?! ...And all this time I was under the impression that some genetic traits were recessive. That whole "you'll be bald if your maternal uncle was bald" thing must be out of date...