Masturbation is common across the animal kingdom but is especially prevalent among primates, including humans. Historically, this behavior was considered to be either pathological or a by-product of sexual arousal, and recorded ...
Plants & Animals
Jun 6, 2023
1
1640
Whenever the "widow" spider is mentioned, people tend to sympathise with the hapless male—best known for its tendency to end up as a post-coital snack.
Plants & Animals
Sep 21, 2016
0
166
Researchers at University of California San Diego School of Medicine previously found a set of human gene mutations that protect older adults against cognitive decline and dementia. In a new study, published July 9, 2022 ...
Evolution
Jul 18, 2022
0
503
A pair of researchers, one with the University of California, the other with the Max Planck Institute for Evolutionary Anthropology, has found that women in an East African community benefit from multiple marriages while ...
The impact of hatcheries on salmon is so profound that in just one generation traits are selected that allow fish to survive and prosper in the hatchery environment, at the cost of their ability to thrive and reproduce in ...
Evolution
Dec 19, 2011
100
0
Male nursery web spiders (Pisaura mirabilis) prepare silk-wrapped gifts to give to potential mates. Most gifts contain insects, but some gifts are inedible plant seeds or empty exoskeletons left after the prey has already ...
Plants & Animals
Nov 13, 2011
5
0
Just as styles in sexy clothes or fashion change from year to year and culture to culture, "sexy" genes, or genes specific to sex, also change rapidly. But there is one sex-specific gene so vital, its function has remained ...
Biotechnology
Jul 15, 2010
11
0
Violent conflict may, under certain conditions, offer a biological benefit to those who take part in it, a Harvard study has found.
Other
Dec 29, 2014
92
0
New evidence proves humans are continuing to evolve and that significant natural and sexual selection is still taking place in our species in the modern world.
Evolution
Apr 30, 2012
98
0
Females play a larger role in determining paternity than previously thought, say biologists in Syracuse University's College of Arts and Sciences. Their findings are the subject of a new paper titled "Female mediation of ...
Plants & Animals
Jun 10, 2013
0
0
Reproductive success is defined as the passing of genes onto the next generation in a way that they too can pass those genes on. In practice, this is often a tally of the number of offspring produced by an individual. A more correct definition, which incorporates inclusive fitness, is the relative production of fertile offspring by a genotype. For example, the offspring produced as a result of normal mating are an example of reproductive success, because they too can pass their genetic material on to the next generation. Alternatively, the birth of a mule as a result of the mating of a horse and a donkey is not an example of reproductive success because the mule is sterile and thus not able to continue the germ line.
Reproductive success is part of the calculation for fitness and a key element in the theories of natural selection and evolution.
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