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> Which is why only males appear from this parthenogenesis

Could you explain the mechanism? If the female has both chromosomes, why couldn't it produce offspring with both?

The mechanisms of parthonenogensis aren't fully characterized, but at a high level, it occurs in a secondary oocyte during meiosis II -- the oocyte only starts out with a Z or W chromosome.

It's perhaps best shown in this figure: https://rep.bioscientifica.com/view/journals/rep/155/6/image...

(Via this paper: https://pubmed.ncbi.nlm.nih.gov/29559496/)

The mostly likely path to parthenogenesis in a ZW female is making ZZ and WW offspring, and the WW is usually not viable.

https://en.wikipedia.org/wiki/Parthenogenesis#Sex_of_the_off...

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