Re: Platypus genome

[evelyn sobielski <koreke77@yahoo.de>]

> > And that [the _s_ex-determining _r_egion on the
> _Y_
> > chromosome] can transpose - rarely, but it has
> happened
> > at least once and perhaps twice in _Ellobius_ (a
> rodent).
> 
> Wow. How does it do its sex determination then? 

IONO, there are at least 3 species with odd sex
determination in that genus, and in _E. lutescens_ it
is just... plain weird, with the diploid set of
chromosomes being odd-numbered! I have not yet read
doi:10.1007/s10577-007-1171-9
http://www.springerlink.com/index/10.1007/s10577-007-1171-9
and doi:10.1159/000104771
http://content.karger.com/ProdukteDB/produkte.asp?Aktion=ShowAbstract&ArtikelNr=104771&Ausgabe=233312&ProduktNr=231547

(I have no access to the latter, so if anyone has I'd
be thankful for a copy)

The drastic change in _E. lutescens_ suggests that
there may well be other rodents in which similar
things have happened. Indeed there is _Tokudaia
osimensis_ (a species complex), see
doi:10.1007/s003350010228
http://www.springerlink.com/content/tb0gyegkx22tdyjc/
where a similar situation exists. And there is another
murid where XY as well as XX females occur (males are
XY), and at least one which has an X0/XY system. 

These are all Eumuroida.


Regards,

Eike


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