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Tasty-Fox9030 t1_jc66rdy wrote

I don't know for sure, but thinking about how it works for humans I suspect that in many species the hormone levels would be weird for a typical individual of either sex and that might cause infertility. It's usually pretty hard to prove a negative though, I wouldn't be utterly shocked if something fairly basal like a frog might have one set of gametes or the other come out functional.

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RonJohnJr t1_jc9858c wrote

Birds can have bilateral gynandromorphism. Someone needs to dissect a specimen to see whether it has functional ovaries, oviduct and testes.

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Tasty-Fox9030 t1_jc9lz33 wrote

It's definitely an interesting question. My strong suspicion is that gynandromorphs probably have an intermediate level of sex hormones and even if the organs were properly developed this would tend to prevent fertility but it's not like I've checked.

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