Tuesday, December 15, 2015

Hybrid frogs


Whoa. Apparently these frogs have only halfway speciated.

P. esculentus ( genome RL) generally produces offspring by mating with another species, usually P. lessonae. In most populations, they produce gametes that only contain the R genome (the L genome is discarded): mating with P. Lessonae restores the L genome. Presto, more hybrids.

They can mate with others of their kind, but few tadpoles survive – essentially because the parental genome (R) does not go through sexual recombination – thus mutations have accumulated over the many generations since the original hybridization. Muller's ratchet.

In eastern Europe, it's the other way around: the L genome is clonal and the hybrids have to mate with P. ridibundus, with complex results (3/4 hybrids, 1/4 pure ridibundus).

Crazy, huh?


If I esteem mankind to be in error, shall I bear them down? No. I will lift them up, and in their own way too, if I cannot persuade them my way is better; and I will not seek to compel any man to believe as I do, only by the force of reasoning, for truth will cut its own way.

I could not love thee, dear, so much,
Loved I not Honor more.

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