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Can someone explain
>What makes animals able and unable to breed with each other?
>How different/how long separated from one species do they need to be considered a new species rather than a sub-species?
>What decides between positive heterosis and negative heterosis?
I have two fantasy species that are the main progenitors of another species. The first two are extinct now but while I don't need it to be 100% scientifically accurate I'd like to expand on their genetics on how the newer species came to be.
Species A fucked themselves over from favoring vanity and starting using species B in an attempt to revive themselves.
I imagine they had problems with sterility, growth dysplasia, autoimmune disorders, etc at least in the beginning. Maybe still so. I haven't decided how long the progenitor breeding went on or how long the newer species has been around.
Pic related, a goat-sheep hybrid and not a chimera. I can't go the chimera route as it would only pass on one or the other's genes.
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Would also appreciate links if you don't want to dumb it down for me.
Here's Motty, an african/asian elephant hybrid who unfortunately did not survive long. I bring these up because they're way more different from one another than say, a coyote and wolf.
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File: f-d 0cfa6ca6bdccc9a09f3ffe60c5e3d777529c14771d85ab4cc4f712b1+IMAGE_THUMB_POSTCARD_TINY+IMAGE_THUMB_POSTCARD_TINY.1.jpg (34KB, 500x400px) Image search:
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>What makes animals able and unable to breed with each other?
pic related
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>>2432514
The simplest way I can explain it is that all DNA has a security system to protect itself. If any DNA doesn't have the right "password" so to speak it gets rejected by the recipient host.
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>>2432514
Look up phenotypic plasticity, op. Youll have a field day
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There are species that are close enough to produce offspring but the resulting young are always sterile. Lots of cases with reptiles like that.
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>>2432723
Not always, some hybrids can be fertile.
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>>2432724
Yes of course. My point was that unstable (infertile) hybrids are possible.
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>>2432628
ohhhhhhhhhhhh
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