5 ms·

> 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 offspri

by rory 5y ago

> 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?

smiley1437 5y ago
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_offspring https://en.wikipedia.org/wiki/Parthenogenesis#Sex_of_the_off...
semenko 5y ago
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/images/REP-17-0728fig1.jpeg https://rep.bioscientifica.com/view/journals/rep/155/6/image... (Via this paper: https://pubmed.ncbi.nlm.nih.gov/29559496/ https://pubmed.ncbi.nlm.nih.gov/29559496/)