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Baffling genetic barrier in some closely related species prevents interbreding
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I've heard of these before. IIRC they do interbreed, but the crossbreeds are weaker than either true breed. Thus there's selection pressure against interbreeding. What you've quoted suggests that being heterozygous for that DNA segment is bad news. Though if there's so little difference between the birds, I can't see how there can be much that would provide any breeding preference, so maybe there isn't any substantial barrier yet, it's just that the downside of doing so keeps the populations pure.
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The differences in colouration might play a part. Or maybe they don't like each others songs.1Cor 15:34 Come to your senses as you ought and stop sinning; for I say to your shame, there are some who know not God.
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Scripture before Tradition:
but that won't prevent others from
taking it upon themselves to deprive you
of the right to call yourself Christian.
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Subscribing so I can reread this later. I don't get it yet."He is no fool who gives what he cannot keep to gain that which he cannot lose." - Jim Elliot
"Forgiveness is the way of love." Gary Chapman
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Not totally new. I read something like this before concerning tropical birds, and the relationship between varieties, subspecies and closely related species, but was only observations in the wild and certain closely related groups did not appear to interbred.Last edited by shunyadragon; 08-25-2014, 06:07 PM.
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Dur!"He is no fool who gives what he cannot keep to gain that which he cannot lose." - Jim Elliot
"Forgiveness is the way of love." Gary Chapman
My Personal Blog
My Novella blog (Current Novella Begins on 7/25/14)
Quill Sword
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Originally posted by phank View PostOne implication of this is, it could require amazingly small changes to trigger a speciation branching event. Something that causes slightly different coloration, pheromones, mating displays, etc.To say that crony capitalism is not true/free market capitalism, is like saying a grand slam is not true baseball, or like saying scoring a touchdown is not true American football ...Stefan Mykhaylo D
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