Not to get too far off topic but speaking of dogs I saw a terrier /black lab cross last weekend never would have guessed it was possible
i need a scientific answer
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gomezladdams said:
as people have been saying...
domesticated dog breeds are the SAME EXACT SPECIES.
First some basics. New species are created from old species either through mutations or through separation. A massive mutatuion creating a new species ist yet to be observed but is believed to be possible. Your project has to investigate the other mechanism: separation, isolation and different environment. If you put 2 groups of cats in 2 different environments(one with say 122 F° temp, the other with 23°F), don't allow cats form group 1 to mate with cats from group 2, and wait 20 000 years you will end up with two different species.
The first one will be (most likely) hairless, the second one really furry. Why is that? Because sometimes cats are born with birthdefects like no fur. This happens very very rarely, but it does. Such a cat will be more better off in a hot environment since it won't risk a heat stroke, will be able to hunt more actively etc. It also means it will live longer and thus be able to have bigger offspring(also hairless). At one point, the "normal" cats will simply die out, they will have to mate with hairless mates, having hairless offspring respectively.
The same principles apply to the other group of cats, rarely a cat is born with an excessive fur and the cold environment will encourage those animals to become widespread.
That will be the effect of the factor temperature. If you feed the first group with mice only during the day, they will become day predators. If you feed the second group only at night, at the end they will be a nocturnal species. The options are really endless, just add more factors. Factors can also be related to the reproductive cycle like better reproductive cells movability in high/low temp, high/low pH etc. Anything pertaining to the reproduction can be influenced by the environment either by chance or by some immortal scientist.
Maybe in Africa there is some animal that likes "eggs on a substrate" and somewhere in the timeline an egg(and the DNA in it) was irradiated, poisoned, damaged(it can be anything!) and a fish with another behavior emerged. One which didn't use the substrate anymore...(Credits for that go to e!o!z! & SinisterKisses) This also suggests that a mate was born at the same time also with different behavior in order to ferilize egs in a new manner. Evolution is simply a string of "lucky" coincidences and that is why it takes so long.
We have taken matters in our hands and considerably speed up things. Instead of supplying a herd of cattle with lots of food for thousands of years untill all newborns are becoming really meaty, we simply take the biggest 2 or three animals and allow only them to breed. Their offspring will be like the parents. Or if you like more colorful fins you simply pick such parents, let them breed and discard the rest of the fish.
All this is the classical evolutionary theory as suggested mainly by Darwin. It turns out however, that mates from different species can have offspring. Classical examples are the hinny(from a male horse and a female donkey) and the mule (from a male donkey and a female horse). Both are unable to reproduce and the modern theory of evolution does not consider them as species. Among other new ideas, the modern theory is exactly about that - for a group of animals to be considered a species, they must be able to reproduce.
So, by definition, CA/SA won't interbreed with africans. If they would(and also have an offspring able to reproduce), they wouldn't be classified as 2 different species. As to why excatly in physiological terms - it may be simply because the male reproductive cell lacks a certain enzyme to dissolve the cell wall of the female reproductive cell.
The sexual attraction is not a factor per se as you can "force" different species to mate, like taking reproductive cells and mixing them in a laboratory.
Ah, yes. You can also crossbreed dogs and wolves, whether the offspring is going to be sterile I am not sure, but I would say so.
The first one will be (most likely) hairless, the second one really furry. Why is that? Because sometimes cats are born with birthdefects like no fur. This happens very very rarely, but it does. Such a cat will be more better off in a hot environment since it won't risk a heat stroke, will be able to hunt more actively etc. It also means it will live longer and thus be able to have bigger offspring(also hairless). At one point, the "normal" cats will simply die out, they will have to mate with hairless mates, having hairless offspring respectively.
The same principles apply to the other group of cats, rarely a cat is born with an excessive fur and the cold environment will encourage those animals to become widespread.
That will be the effect of the factor temperature. If you feed the first group with mice only during the day, they will become day predators. If you feed the second group only at night, at the end they will be a nocturnal species. The options are really endless, just add more factors. Factors can also be related to the reproductive cycle like better reproductive cells movability in high/low temp, high/low pH etc. Anything pertaining to the reproduction can be influenced by the environment either by chance or by some immortal scientist.
Maybe in Africa there is some animal that likes "eggs on a substrate" and somewhere in the timeline an egg(and the DNA in it) was irradiated, poisoned, damaged(it can be anything!) and a fish with another behavior emerged. One which didn't use the substrate anymore...(Credits for that go to e!o!z! & SinisterKisses) This also suggests that a mate was born at the same time also with different behavior in order to ferilize egs in a new manner. Evolution is simply a string of "lucky" coincidences and that is why it takes so long.
We have taken matters in our hands and considerably speed up things. Instead of supplying a herd of cattle with lots of food for thousands of years untill all newborns are becoming really meaty, we simply take the biggest 2 or three animals and allow only them to breed. Their offspring will be like the parents. Or if you like more colorful fins you simply pick such parents, let them breed and discard the rest of the fish.
All this is the classical evolutionary theory as suggested mainly by Darwin. It turns out however, that mates from different species can have offspring. Classical examples are the hinny(from a male horse and a female donkey) and the mule (from a male donkey and a female horse). Both are unable to reproduce and the modern theory of evolution does not consider them as species. Among other new ideas, the modern theory is exactly about that - for a group of animals to be considered a species, they must be able to reproduce.
So, by definition, CA/SA won't interbreed with africans. If they would(and also have an offspring able to reproduce), they wouldn't be classified as 2 different species. As to why excatly in physiological terms - it may be simply because the male reproductive cell lacks a certain enzyme to dissolve the cell wall of the female reproductive cell.
The sexual attraction is not a factor per se as you can "force" different species to mate, like taking reproductive cells and mixing them in a laboratory.
Ah, yes. You can also crossbreed dogs and wolves, whether the offspring is going to be sterile I am not sure, but I would say so.
Half said:
superb.
and it must NEVER be overlooked that Evolution is "Chance"... or "Luck"
great work.
icthyophile said:
heh, roughly. be careful there
there is over 100,000+ years of evolution at play with race.
only around 2-3000 with dogs.
PeacockBass said:
I know its possible as far as genetic material,I meant physically I mean my lab is about 120 lbs and terriers are what 6lbs?I started to speculate how it could happen which would have to be the male but my wife requested I shut up.
