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Biodiversity Blog

 

Where Do Viruses Come From?

Viruses gym web   Illustration: Nicole Elmer The origin of viruses is a hotly debated topic. It’s unclear how they first evolved. However, there are many ideas floating around out there. There are three classical hypotheses but many new ideas and discoveries challenging them. The first one is the virus first hypothesis, and states that since viruse...

To Egg or Not to Egg: That is the Evolutionary Question

oviparity P.p.2   A young lizard crawls over the eggs of its brethren. (Photo: Yin Qi) The old riddle “Which came first, the chicken or the egg?” is not much of a riddle to biologists. The shelled amniote egg, which is familiar to many of us as chicken eggs, evolved about 325 million years ago. The wild ancestors of chickens, in contrast, only appe...