News tagged with sex

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Five genes to predict colorectal cancer relapses

Researchers at the Catalan Institute of Oncology-Bellvitge Biomedical Research Institute (ICO-IDIBELL), led by David Garcia-Molleví have identified 5 genes differentially expressed in normal accompanying ...

21 hours ago
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Females ignored in basic medical research

A new study from Northwestern Medicine has found that surgical researchers rarely use female animals or female cells in their published studies—despite a huge body of evidence showing that sex differences can play a crucial ...

Aug 28, 2014
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Capturing false hormones

They damage our ability to reproduce, and they pollute the natural environment. Yet chemicals known as hormone mimics can be found in consumer goods. Eventually they end up in our water. But we now have a way of capturing ...

Aug 15, 2014
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HIV pills show more promise to prevent infection

There is more good news about HIV treatment pills used to prevent infection in people at high risk of getting the AIDS virus: Follow-up from a landmark study that proved the drug works now shows that it does ...

Jul 22, 2014
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Sex

In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes). Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.

An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.

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