In 2003 scientists met and considered the challenges of a multi-generation starship concept. And in these thoughts they considered that a group of roughly around 200 persons would be the lowest end of the bargain, if you wish to uphold diversity in the genepool ... If you like to learn more about it, read this book:
http://books.google.de/books/about/I...AJ&redir_esc=y
The Colonists are far below this.
Even if they meet other survivors - and we already know how bad this may end -, the other group(s) need to be big enough to reach this critical mass ...
Best wishes!
Liam
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