Single Gene Variant Thought Responsible for Dog Size Diversity

When you look at pictures like this one, keep in mind that these two have a last common ancestor a mere few thousand years ago:

Amazing, isn't it, that the evolution of one gene region can be responsible for such a size diversity? A single insulin growth factor causes this, and dogs have the greatest diversity in size of any mammal.

Yes, I can hear the creationists crying in unison, "But they're both still dogs!" (And therefore evolution is false.) And indeed, they are both dogs. Now, let's take them into isolated environments and disallow crossbreeding for a few more thousand years, and see if they are still inter-fertile.

Then, the creationists will have to cry about something else.

Isn't evolution beautiful?
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