The only evidence of a XY system previously was the banana. Warren Booth was researching pathogenesis and ran into problems with that on the ZW system and im sure he also knew about the anomaly with the banana gene. He not only showed pythons and boas to have an XY system, compared to rattle snakes which still have a ZW. He found the python and boa systems developed independently of each other. Giving the different location of the RAD markers. We all knew the XY system worked with the banana gene, just there was no evidence besides that to show an XY system as it contradicted years of published papers "proving" an ZW system. Warren was able to wash all that away assuming his research holds up, which so far it absolutely has.
Here is his paper https://drive.google.com/file/d/0B64...J2dXp3eWc/view
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