Evidence for Evoluti18

Evidence for Evoluti18 - Evidence for Evolution Isolation...

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Evidence for Evolution Isolation mediated by microorganisms In the paper outlined here (Breeuwer and Werren, 1990) the authors examine two species of wasps living sympatrically (in the same area). Wasps (like ants, bees and termites) are haplodiploid organisms. In these organisms, females develop from fertilized eggs (so there is a male and a female contribution to the genome (i.e. sperm and egg)) while males develop from unfertilized eggs (so there is no male contribution to the male genome). The authors of the paper experimented with two species of wasps, N. vitripennis and N. giraluti. They noticed that when they crossed individuals from different species, only males were produced. In other words, fertilization was not occuring. They found out that this was the result of microorganisms in the cytoplasm of the gametes destroying the males chromosomes from his sperm. Microorganisms had been seen in the cytoplasm of the eggs of these species, but this alone did not prove that they were the cause of the reproductive isolation. So what they did was feed some
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Evidence for Evoluti18 - Evidence for Evolution Isolation...

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