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426 points sampo | 1 comments | | HN request time: 0.303s | source
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corygarms ◴[] No.45302603[source]
This is nuts. If I'm understanding correctly, the M. ibiricus queen mates with a M. structor male, uses his sperm to create sterile, hybrid female worker ants for her colony, then she (astonishingly) can also lay eggs that develop into fertile M. structor males, which means she has removed her genetic material from the egg and effectively cloned the male she previously mated with.
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sidewndr46 ◴[] No.45302659[source]
Yeah, I came here to say the same thing. I'm really confused how the female can produce a clone of the male of another species. Wouldn't the other males sperm contain only half the genetic material needed to reproduce? But apparently ant DNA doesn't work that way for sex:

https://press.uni-mainz.de/determining-sex-in-ants/

somehow a male ant has one set of chromosomes while the female ant has two sets of chromosomes. So a male ant sperm must contain enough information to make a complete male? Then when they mate with the female of the other species, the females egg actually gets blanked out so to speak, containing none of the females own genetic material. Then the male sperm fertilizes the egg with one set of chromosomes producing a male offspring that is a clone?

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tsimionescu ◴[] No.45303135[source]
Note that many, many animals have non-genetic sex determination. Most fish, amphibians, and reptiles have the same genes for both males and females. Sexual differentiation typically depends on things like the egg temperature or salinity and so on. Some species can even change sex during their adult lifetimes, with external conditions triggering a complex hormonal shift that convert an adult, fertile male into an adult, fertile female.

Having genetic differences between males and females is mostly a bird and mammal thing, at least among vertebrates.

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soperj ◴[] No.45303319[source]
Man, the bible missed all of this when they were talking about the two animals of every species on the Ark. What else did they leave out?
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tsimionescu ◴[] No.45303362[source]
To be fair, you almost always still need two individuals to get reproduction going - you just don't need to be as picky about which two individuals as you might think. There are a rare few animals that can sometimes self-reproduce, but it's not a common strategy in the animal kingdom, even among hermaphroditic animals.
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duskwuff ◴[] No.45303803[source]
They're less rare than you might think. Parthenogenesis ("virgin birth") occasionally occurs in some domestic birds, including chickens and turkeys. Due to the way sex determination works in birds, the offspring created this way are always male.

https://www.sciencedirect.com/science/article/pii/S003257911...

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1. rsynnott ◴[] No.45307587[source]
There are also a number of species of lizards, and one snake, which reproduce exclusively via parthenogenesis: https://en.wikipedia.org/wiki/Parthenogenesis_in_squamates

In some though not all such species, there are no known male examples _at all_ (though in reptiles some forms of parthenogenesis can produce males).