Evolution procedes by repeated speciation, producing a kind of "family tree," just like a real bush or tree grows by repeated branching. lf a twig on one limb of the tree branches into two twigs, can one of those twigs become a twig on another limb? Or do they both remain on the same limb?
But perhaps I didn't understand the question mindlight raised--Hans had a different and more articulate answer, so it could be that he understood it better.
However, I suspect that the basis of mindlight's issue is that he may visualize the higher taxa as pre-existing categories into which creatures evolve, rather than being formed ad hoc as speciation continues.
The question / statement about nothing
evolving or "jumping" to a different genus
comes up often, along with its evil twin about
"fully formed / half formed".
Ive asked about the supposed mechanism
that sets limits to " microevolution".
Ive asked what they think is a "kind" , a species, a genus?
Ive sskrd what what a half formrd wing woul look like
Etc.
Theres never an actual response.
The which of why being they did not get to their
supposed killer gotcha by srudy of biology but by
memorizing quips on creationist sites.
So of course when asked for some depth to their
wise pronouncements, they cannot deliver.
I dont expect present creo- company to understand any
biology, and, they dont.
To their credit there os a touchung childish innocence
about it, to matching discredit is the refusal to grow up.
I think i could very adequately deecribe how one genus
by stages begets others, but i dont think its possible
to educate sealed off from understanding.
One little detail, aboutv "kind". By any definition of the
word, the bible actually does get it right, reproduction
after kind.
No generation is exactly like parents of cpurse; we all
know that.
Accumulated differences never involve a " jump", ;
offspring are always the same kind as parent.