Female promiscuity—something that occurs in a majority of species, including humans—results in the ejaculates from two or more males overlapping within her reproductive tract. When this happens, sperm compete for fertilization ...
Evolution
Sep 26, 2013
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New research out of Queen's University indicates that women are changing their views on bearing children.
Social Sciences
Aug 15, 2013
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Our most pressing environmental challenge is not how many people the planet can support, but rather how many cellphone-toting, satellite-TV-watching, gas-guzzler driving members of the middle class it can bear.
Energy & Green Tech
Apr 23, 2013
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So-called 'selfish genes' may make females more promiscuous and also lower male fertility.
Plants & Animals
Feb 1, 2013
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All a question of timing: When bushcrickets mate, the male attaches a sticky package, the so-called spermatophore, to the female's abdomen. Alongside the sperm themselves, this 'bridal present' consists of a protein-rich ...
Plants & Animals
Dec 14, 2012
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(Phys.org) -- Why do adults continue to play throughout their lives while most other mature mammals cease such behavior? According to researchers at Penn State, playfulness may serve an evolutionary role in human mating preferences ...
Social Sciences
Aug 3, 2012
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Researchers in India have developed an improved expert system for the diagnosis of thyroid disease. They describe details of their approach to screening medical data in a forthcoming issue of the International Journal of ...
Computer Sciences
Aug 2, 2012
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(Phys.org) -- Five-month-old female alligators exposed during development to toxins found in a polluted Florida lake show changes in ovarian gene function and decreased body weight at hatching, but paradoxically showed accelerated ...
Plants & Animals
Jul 20, 2012
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Fears that sex-linked chromosomes, such as the male Y chromosome, are doomed to extinction have been refuted in a new genetic study which examines the sex chromosomes of chickens.
Biotechnology
May 8, 2012
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A team of New York University biologists has uncovered a previously unknown role for a set of cells within the female reproductive tract of fruit flies that affects the functioning of sperm and hence fertility. Their discovery, ...
Plants & Animals
Nov 8, 2011
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