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EvC Forum ⇒ Science Forums ⇒ Biological Evolution ⇒

All species are transitional

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Author Topic:   All species are transitional
Nighttrain
Member (Idle past 4023 days)
Posts: 1512
From: brisbane,australia
Joined: 06-08-2004

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Message 178 of 246 (255223)
10-27-2005 8:41 PM 		Reply to: Message 176 by RAZD
10-27-2005 8:06 PM

Re: Species Transition Point
The sexual selection barrier may apply when the living is easy, but when times get tough the selection of mates may be less picky when survival is at stake.
This was observed on the Galapagos Islands when two finch species interbred during a drought that did not interbreed before or after the drought.
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So the blocking mechanism preventing mating between different species, barring environmental factors, is tied in with physical appearance or a surface level. As against a block on the cell level where different species may mate but produce no viable issue?
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Wish I could explain that to my neighbour`s Dalmatian who repeatedly humps a concrete statue of Venus deMilo in his garden.
This message is a reply to:
 Message 176 by RAZD, posted 10-27-2005 8:06 PM RAZD has replied
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