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Tau caste interbreeding.
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Old 10 Oct 2006, 10:59   #11 (permalink)
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Default Re: Tau caste interbreeding.

The Imperium already have a theory like that; exterminate the Fio, and the Tau would lose all their agriculture / industry.

Research into bio-weapons capable of this is continuing...
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Old 10 Oct 2006, 23:30   #12 (permalink)
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Default Re: Tau caste interbreeding.

Wargamer has an interesting theory but it is higly unlikely. For them to be unable to interbreed they would have to have a different number of chromosones. This to my knowledge is nigh impossible to achienve through evolution, even our single cell ancestors had 48 (in theory).

for the record, foxes and dogs can interbreed, and it is common where I'm from. the mixed breeds are called corndogs. Wolves are compatible as well.
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Old 11 Oct 2006, 09:56   #13 (permalink)
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Default Re: Tau caste interbreeding.

Quote:
Originally Posted by Malcaor
Wargamer has an interesting theory but it is higly unlikely. For them to be unable to interbreed they would have to have a different number of chromosones. This to my knowledge is nigh impossible to achienve through evolution, even our single cell ancestors had 48 (in theory).

for the record, foxes and dogs can interbreed, and it is common where I'm from. the mixed breeds are called corndogs. Wolves are compatible as well.
However, there are countless breeds of birds that cannot interbreed. Horses and Donkeys can interbreed, as can Lions and Tigers, but both produce infertile offspring. I would assume your "corndogs" are also infertile.

Thus, it is not unreasonable to assume the Castes are no longer genetically compatable.
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Old 11 Oct 2006, 11:33   #14 (permalink)
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Default Re: Tau caste interbreeding.

Changes in numbers of chromosomes are not impossible at all. How do you think all the different species today ended up with different numbers of chromosomes?

By the way, we have 46 chromosomes. Not 48. Our closest cousins (chimpanzees, bonobos, gorillas and orangutans) do have 48, however.
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Old 11 Oct 2006, 18:02   #15 (permalink)
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Default Re: Tau caste interbreeding.

Quote:
Originally Posted by Malcaor
For them to be unable to interbreed they would have to have a different number of chromosones.
False. There are different species with the same number of chromosomes that are unable to interbreed. Humans and hares, for example, both have 46 chromosomes.

Quote:
Originally Posted by Malcaor
This to my knowledge is nigh impossible to achienve through evolution, even our single cell ancestors had 48 (in theory).
As Kasrkin points out, we have 46 chromosomes, while other apes have 48. This difference evolved comparitively recently, when several of the chromosomes in one of our ancestors fused together, reducing the number from 48 to 46. If you look at human chromosome 2, you can make out the end-points of the chromosomes that fused together - there's a detailed paper on it here.

Our earliest single-celled ancestors were bacteria, which don't have neatly paired chromosomes like eukaryotes (including us) do. In some cases, they only have a single, circular chromosome.

Quote:
Originally Posted by Wargamer
Horses and Donkeys can interbreed, as can Lions and Tigers, but both produce infertile offspring.
There are various degrees of separation between subspecies. They may be completely unable to breed, or they may only produce infertile offspring. In cases of only very slight speciation, they may produce fertile offspring, but their grandchildren may be sickly or infertile.

Which one of these is the case for the Tau, I don't know. It depends how long the castes have been reproductively isolated, how much genetic drift has occurred, whether there's been any engineering or artificial selection of their genome, etc.
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Old 11 Oct 2006, 18:13   #16 (permalink)
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Default Re: Tau caste interbreeding.

it doesn't matter how many chromosones you have to be able to reproduce, a person with downsymdrome(sp?) has 47 and they are still able to have kids.
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Old 11 Oct 2006, 23:02   #17 (permalink)
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Default Re: Tau caste interbreeding.

Thanks for the replies, guys!

In the rare instance that two caste members interbreed, and a child was produced, why would they have no particular attributes? I'd assume Fio + Shas would give you a fairly small Tau with big muscles (for their race, anyway). Of course, this assumes that Tau genetics work like that.

Quote:
Originally Posted by Malcaor
it would become a tayu with nor particular attributes, the gene pool would be muddled and the tau would no linger be specialised for their tasks making their lives much harder.
Has a Tau like that ever been mentioned or shown before? I'm quite curious.
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Old 11 Oct 2006, 23:51   #18 (permalink)
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Default Re: Tau caste interbreeding.

Quote:
Originally Posted by Wargamer
Thus, it is not unreasonable to assume the Castes are no longer genetically compatable.
Another strong argument for this idea is that the various sub-species of Tau remained divergent even after they were reintroduced. To have seperated into different sub-species in the first place, we have to assume some geographic differentiation of the available gene pool (which we have in the history). But the species were reintroduced to each other long before the Ethereals took power and set up the Caste system. If the various sub-species were capable of producing fertile off-spring with each other, we would expect the diversity in the Tau gene pool to decrease after they were reintroduced to each other as Tau from the various septs interbred and shared traits. The fact that we don't have any record of such suggests that it is no longer biologically possible, or else taboo to the extent that it is a moot point.
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Old 12 Oct 2006, 00:12   #19 (permalink)
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Default Re: Tau caste interbreeding.

I think the castes have been breeding exclusively inside their own to the point where they may not be able to breed with other castes.
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Old 12 Oct 2006, 00:14   #20 (permalink)
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Default Re: Tau caste interbreeding.

the first time you would have say a semi good fighter/worker, then the seocnd time you have a semi-semi good fighter/worker/pilot, after enought generations of interbedding you would have a bunch oif tau not good at anything in particular.
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