16-05-2013, 07:30 AM
4
Re: What Came First
Right, I've looked it up and it confirms what I was told years ago that the chicken came first, some change in genetic structure caused it all to happen and it looks as though this Ovocleidin is the change. My question now is: why did it affect all chickens and wasn't just the odd abnormality?
16-05-2013, 07:58 AM
5
Re: What Came First
Originally Posted by ben-varrey
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Right, I've looked it up and it confirms what I was told years ago that the chicken came first, some change in genetic structure caused it all to happen and it looks as though this Ovocleidin is the change. My question now is: why did it affect all chickens and wasn't just the odd abnormality?
The reason all chickens have hard shelled eggs is because at sometime in the distant past when there were birds with both hard(er) and soft(er) shelled eggs the birds with hard shelled eggs had a breeding advantage and out-bred the soft shell producing birds until the later died out. That is what evolution does and how species change over time.
16-05-2013, 08:52 AM
7
Re: What Came First
Originally Posted by Bruce
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Surely that is just the way evolution works? Birds are related to dinosaurs, didn't dinosaurs lay eggs (I have no idea whether hard or soft shells)? the harder shell is just a genetic variation which had some advantage hence it stayed around (evolution doesn't go backwards) and was probably improved upon.The reason all chickens have hard shelled eggs is because at sometime in the distant past when there were birds with both hard(er) and soft(er) shelled eggs the birds with hard shelled eggs had a breeding advantage and out-bred the soft shell producing birds until the later died out. That is what evolution does and how species change over time.
Also, I'm not so sure about evolution not going backwards - according to this chap, that is what will happen (and some of us, after reading his descriptions, would state his projections are a tad too far into the future
)http://news.bbc.co.uk/1/hi/6057734.stm
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