En las especies en las que se ha estudiado ampliamente la partenogénesis, el proceso comienza poco después de la creación del propio huevo. Cuando una célula se divide en dos para dar lugar a una célula huevo, la otra mitad se convierte en un cuerpo polar, que contiene una copia casi idéntica de ADN. Normalmente, el cuerpo polar se desintegra. Pero estudios de otras aves han revelado que, en ocasiones, el cuerpo polar se fusiona de nuevo con el óvulo, actuando como un espermatozoide que lo fecunda.
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"Unfortunately, by the time scientists realized the birds were genetically unique, both of the condors had died, so they weren’t able to study how SB260’s and SB517’s unusual parentage might have affected them. When the birds were alive, they weren’t so remarkable that the zookeepers thought to do a special postmortem exam. “To the people taking care of them, they were another condor,” Ryder says.
But both of the condors did have some documented health issues. SB260, a male hatched at the San Diego Zoo Safari Park in 2001, died two years later after being released into the wild—he was always small and did not integrate well with the wild birds. SB517, a male hatched at Los Angeles Zoo in 2009, had a curved spine and trouble walking. He was never released into the wild and died in captivity at about age eight. (California condors usually live for decades.) “They certainly weren’t, shall we say, shining specimens of the condor,” says Demian Chapman, a biologist at the Mote Marine Laboratory and Aquarium, who has studied parthenogenesis. That’s not uncommon for parthenogenetic animals, also known as parthenotes."
la virgen Maria fue una pionera