3 ms·
Z/w sex chromosome elements.
by throwawaymaths 4y ago
Z/w sex chromosome elements.
- deleted 4y ago[deleted]
- masklinn 4y agoZ/w is not exclusive to birds, and is present in a number of reptiles (as well as fishes and crustaceans). So it could be a recurring sex determination scheme, or it could be a common amniote trait. Either would make a lot more sense than the idea that platypuses would be descendants of birds or whatever.