1Figure 1. Vertebrate sex determination systems.Phylogeny of major vertebrate clades showing the sex determining systems found in members of the respective clade. 'Multiple' indicates involvement of more than one pair of chromosomes in sex determination. Dates of divergence are taken from 42, 82 and 83.TSD: temperature-dependent sex determination.http://scienceblogs.com/evolgen/2006/09/phylogeny_friday_8_september_2.php10 sex chromosomes in the duck-billed platypus!www.abc.net.au/news/newsitems/200410/s1226827.htm
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