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Articles sur Sexual reproduction

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Getting the job done. A female Asian water dragon (Physignathus cocincinus) produced a daughter (left) without the assistance of a male. Skip Brown/Smithsonian’s National Zoo

Virgin births from parthenogenesis: How females from some species can reproduce without males

Parthenogenesis, a form of reproduction in which an egg develops into an embryo without being fertilized by sperm, might be more common than you realized.
Euphanerops, a primitive jawless fish from the World Heritage site at Miguasha, Quebec, which has now been found to have paired hind limb structures and copulatory sex organs. François Miville-Deschênes with permission

The origins of those sexual organs: a fishy tale much more primitive than we thought

Sexual organs similar to what we see in sharks and rays today appeared many millions of years ago in much more primitive ancient fishes than was previously thought.
Gird your loins. Shutterstock

Are plastics making men infertile?

Recent research into the health effects of the plastic-making chemicals phthalates has reignited concerns about low sperm counts. But the evidence is far from conclusive.
A bull male Eastmanosteus placoderm. Placoderms were the first creatures to evolve paired reproductive organs with a bony skeleton called claspers. Brian Choo & John Long, Flinders University.

The first vertebrate sexual organs evolved as an extra pair of legs

We humans use the euphemism for sex that “we like to get a leg over” but the first jawed vertebrates – the placoderms – they liked to get a leg in. They were the first back-boned creatures to evolve male…
Trypanosomes in the blood. Wendy Gibson

Caught in the act: microbes do have sex

There is no denying that humans think sex is important, but it also matters for microbes. Sex allows genes from two parents to be mixed, leading to new combinations of genes in the offspring. In the past…

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