4 ms·
What about the 2nd generation of mule, then 3rd? If the probability of viability keeps dropping generation after generation, eventually it will delete itself?
by acchow 2y ago
What about the 2nd generation of mule, then 3rd? If the probability of viability keeps dropping generation after generation, eventually it will delete itself?
- Amezarak 2y agoIt doesn't work like that. Backcrossing it with one of the parent species (assuming fertility in the first place) as you'd expect tends to increase the likelihood of fertile offspring in proportion to the number of generations. And that's exactly what you'd expect in any hybridization event. And anyway, mules are actually pretty special in that horses and donkeys are actually fairly distant relatives (diverged 4 million years ago) and have different numbers of chromosomes. All members of homo (supposed to have emerged all more recently than 3 million years ago) could probably interbreed and the ones that had the opportunity probably did. It's really unfortunate that schools tend to simplify the definition of species in this way, because it's just not really not meaningfully true at all. We could "make" it true by actually defining species this way (at least for animals) but it'd radically transform our taxonomies.
- dbf60fcd 2y ago[flagged]