Studying sex from just the male perspective misses half the experience. But much of what we know about the origins of reproductive cells comes from looking at sperm and egg formation separately—or only focusing on sperm.
Cell & Microbiology
19 hours ago
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1
When animals of two different species mate, their hybrid offspring can be unhealthy or sterile. Often, only one sex is affected.
Evolution
Nov 20, 2023
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28
In recent years, we've seen a burgeoning social movement for the acceptance of asexuality. We've also seen more asexual characters popping up in shows such as Heartstopper and Sex Education.
Social Sciences
Nov 17, 2023
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As more research reveals how many microplastic particles humans are ingesting and absorbing in their bloodstreams, Duke and Appalachian State researchers led by Joana Sipe and Christine Hendren have examined a source for ...
Nanomaterials
Nov 14, 2023
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8
Green sea turtles, Chelonia mydas, are listed as endangered on the IUCN Red List of Threatened Species. They are at risk of extinction due to poaching, collisions with boats, habitat destruction, and accidental capture in ...
Plants & Animals
Nov 13, 2023
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Researchers at the Francis Crick Institute and Heidelberg University in Germany have shown that sex differences in animals vary dramatically across species, organs and developmental stages, and evolve quickly at the gene ...
Evolution
Nov 2, 2023
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Biological sex can be an important factor in predicting how animal and plant populations respond to temperature changes, from sea turtles whose sex is determined by the heat on the beach where they hatch, to female Arctic ...
Plants & Animals
Oct 27, 2023
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40
It's a familiar story to many of us: In prehistoric times, men were hunters and women were gatherers. Women were not physically capable of hunting because their anatomy was different from men. And because men were hunters, ...
Archaeology
Oct 20, 2023
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Since gay couples have fewer children, the high frequency of same-sex relationships in humans is puzzling from an evolutionary point of view. Perhaps there are social advantages such relationships confer on a group, or perhaps ...
Evolution
Oct 12, 2023
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The main reason for an unbalanced sex ratio in most countries is gender-selective migration. Without sex-selective international migration, country-level sex ratios for young adults would be balanced in almost all countries ...
Social Sciences
Oct 11, 2023
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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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