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A new chemical treatment that can segregate male and female sperm could one day mean parents going through IVF could choose whether they have a boy or girl. In experiments with mice sperm, scientists found they could produce litters that were 90 per cent male, according to the study published in Plos Biology. When the slower sperm were used, litters were 81 per cent female.

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Why organisms began having sex, rather than simply reproducing asexually as life did for billions of years—and still does, in the case of single-celled organisms and some plants and fungi—is a bit of a mystery. Sexual reproduction evolved around a billion years ago or more, despite the additional energy required and the seeming hinderance of needing to find a suitable mate. Prevailing theories hold that sex became the dominant form of reproduction due to the benefits of greater genetic diversity, allowing offspring to adapt to changing environments and keeping species one step ahead of parasites that evolved to plague the parents.

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As a clinical geneticist, Paul James is accustomed to discussing some of the most delicate issues with his patients. But in earlyhe found himself having a particularly awkward conversation about sex. A year-old pregnant woman had visited his clinic at the Royal Melbourne Hospital in Australia to hear the results of an amniocentesis test to screen her baby's chromosomes for abnormalities.

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Organisms reproduce to pass on their genes and create new members of their species. If the organisms of a species all fail to reproduce then the species may become extinct. Asexual reproduction does not involve sex cells or fertilisation.

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Researchers say this is, in fact, the 1 mistake people make which makes them stop enjoying healthy sex life. An adoption that began with the intention of embracing a girl who was either orphaned or abandoned, turned out to be rather traumatic for the child along with her biological and adoptive parents. With nearly people affected by dengue in Kolkata and deaths being reported from North 24 Parganas and Nadia, the state health department has decided to procure bio-larvicide to combat the vector-borne disease.

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Two sexes have never been enough to describe human variety. Not in biblical times and not now. Before we knew much about biology, we made social rules to administer sexual diversity.

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