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(Mother Nature Network)   Scientists say virgin births occur regularly in the wild, Bethlehem   ( mnn.com) divider line
    More: Interesting  
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8329 clicks; posted to Main » on 13 Sep 2012 at 4:06 AM (5 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2012-09-13 04:18:03 AM  
4 votes:
They're not female because the snakes and lizards that have been shown to do this have different sex chromosomes from mammals. Males are ZZ, and females are ZW. When a female reproduces parthenogenetically, about half of her eggs will be allocated a Z and half will be allocated a W. After (presumably) mitosis, you're left with ZZ and WW embryos. The WW all die, and the ZZs all develop, so you get a litter of all males.

Theoretically, if one female invades an area with no males, she could create her own, which could then mate. The resulting population would likely persist for a few generations (which in snakes/lizard, could be a few centuries since some can live 20-40 years), but could become horribly inbred unless it was re-invaded by unrelated individuals.
2012-09-13 12:00:06 PM  
1 vote:
You know, I'm kinda glad as a guy this can't happen to me.

/and the rest of you should be too.
2012-09-13 11:16:46 AM  
1 vote:

foxyshadis: juvandy: They're not female because the snakes and lizards that have been shown to do this have different sex chromosomes from mammals. Males are ZZ, and females are ZW.

Their chromosomes must look all kinds of farked up. Or did we just run out of descriptive letters?


Just different systems. Their sex chromosomes aren;t directly equivalent to mammalian ones so we don't call them X and Y. As for the sex of the offspring, it depends on exactly what meiotic pathway and when the fusion event occurs. In reptiles (and other snakes) that have been shown to do this both male and female offspring are possible, depending on the exact mechanism at work. Which mechanism is used also determines whether offspring are full or partial clones of the mother.
2012-09-13 04:38:05 AM  
1 vote:
images.tvrage.com
You ARE the father... and the mother.
 
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