So how does that actually work, genetics wise? How does a single "mongrel dog" posses genes of all those different breeds? Are any novel genes arising during the selective breeding of dogs? Or do the ancestral populations posses all possible genetic variants?
Pretend you're explaining this to someone who knows nothing about genetics. How would you explain the above?
Also, did you read through the reference you cited? And have you checked any of the citations in that particular reference? I asked, because I'm reading through a cited reference on how novel
ACSL4 and
IGSF1 gene variants arose. I'd be interested in your thoughts on that. How do you think those novel
ACSL4 and
IGSF1 variants arose?
Analysis of large versus small dogs reveals three genes on the canine X chromosome associated with body weight, muscling and back fat thickness
(I'm also curious if you're a subscriber to the Noah's Ark/global flood scenario. I don't recall your views on this. E.g. do you believe that all current living animals were derived from a limited number about ~4000 years ago?
Also, do you believe that dogs are descended from wolves? E.g. humans domesticated wolves. Or do you believe there are separate wolf and dog kinds?)
So how does artificial selection affect the genetics in question?
Where did that variations come from though? For example, I cited a specific example above re:
ACSL4 and
IGSF1 gene variants. Where did those variants come from?
How is this not evolution? In terms of mechanisms, how is what you are describing different from evolution?