Parthenogenesis and null allele

[erie-herps]

It’s not possible. It might be possible to have a split partho clutch but I’m not positive. There’s a good discussion about males in partho clutches here:

Partho mom produces males?

My business partner has a virgin female who produces a fertile clutch every year. My business partner produced her and has owned her for her entire life, so we’re sure she’s never been with a male. Now we have three seasons worth of babies. We assumed they would all be female, but when we actually sexed them, they came out to be a 50/50 males and females. How is this possible?