From: Damien Broderick (d.broderick@english.unimelb.edu.au)
Date: Mon May 27 2002 - 21:48:40 MDT
At 01:04 PM 5/27/02 -0700, Robert wrote:
>So there you have it -- hard numbers.
Good to have. I've accepted somewhere between 70% and 80% as the proportion
of human conceptus rejections, and this confirms that range.
>My only comment is that if
>natural conception and development is so darn difficult, it explains
>a large chunk of why cloning is so problematic.
No it doesn't, not if cloning succeeds in, say, less than 0.5% of attempts
(but maybe the success rate has gone up lately?). A Roslin site (
http://www.roslin.ac.uk/public/cloning.html ) says:
>Success rates remain low in all species, with published data showing
>that on average only about 1% of 'reconstructed embryos' leading to
>live births. With unsuccessful attempts at cloning unlikely to be
>published, the actual success rate will be substantially lower
Damien Broderick
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