Quantcast
Biologists Link Placenta Formation And Sexual Selection

Biologists Link Placenta Formation And Sexual Selection

By Iqbal Pittalwala, University of California - Riverside UC Riverside research shows fish with placentas are smaller and less brightly colored than non-placental fish Sexual selection refers to species' selection for traits that are...

Latest Selection Stories

It's Not All Sexual Selection
2014-03-05 14:54:45

University of Maryland Baltimore County Since the days of Darwin, scientists have considered bird song to be an exclusively male trait, resulting from sexual selection. Now a team of researchers from the University of Maryland, Baltimore County (UMBC), the University of Melbourne in Australia, Leiden University in the Netherlands and The Australian National University says that's not the whole story. The team used information from several sources, including the Handbook of the Birds of...

Infidelity Linked To Large Testicles
2014-01-29 10:15:23

Yngve Vogt  - University of Oslo “We can be grateful to parasites, bacteria and viruses for our ability to have sex. Even though sexual reproduction is far less efficient than non-sexual, nearly all living organisms that you can observe in your environment are based on sexual reproduction. The most important function of sex is to reshuffle the genes in each mating. In this way, the immune system develops resistance to parasites, bacteria and viruses,” explains Petter Bøckman,...

Engineering Plus Evolutionary Analyses Used To Answer Natural Selection Questions
2014-01-24 14:45:08

University of Massachusetts at Amherst Introducing a new approach that combines evolutionary and engineering analyses to identify the targets of natural selection, researchers report in the current issue of Evolution that the new tool opens a way of discovering evidence for selection for biomechanical function in very diverse organisms and of reconstructing skull shapes in long-extinct ancestral species. Evolutionary biologist Elizabeth Dumont and mechanical engineer Ian Grosse at the...

Veil Of Ignorance Is Sometimes Bliss
2013-10-24 08:22:27

Washington University in St. Louis A range of examples suggests a lack of information about their fellows can favor cooperation and prevent conflict among animals — and even among genes For the Oct. 16 issue of Biology Letters, a special issue commemorating the 50th anniversary of W.D. Hamilton’s famous paper on kin selection, two Washington University in St. Louis biologists contributed an article describing intriguing exceptions to one of his predictions. The basic idea of...

2013-09-18 15:43:41

Saving energy is important for humans and animals alike when resources are limited. Scientists at the Research Institute of Wildlife Ecology of the University of Veterinary Medicine, Vienna, found out that although higher-ranked red deer gain privileged access to patches of food, they also have higher metabolic rates and thus use more energy. This can be a serious disadvantage in winter when red deer rely largely on their limited stored body fat to survive. Energy budget adjustments...

Genome Police Undermined By Selfish Gene
2013-03-05 10:58:36

Brown University Biologists have been observing the “selfish” genetic entity segregation distorter (SD) in fruit flies for decades. Its story is a thriller among molecules, in which the SD gene destroys maturing sperm that have a rival chromosome. A new study reveals a tactic that gives SD´s villainy an extra edge. For a bunch of inanimate chemical compounds, the nucleic and amino acids caught up in the infamous “selfish” segregation distorter (SD) saga have...

Humans, Chimps Utilize Same Genetic Variants To Fight Pathogens
2013-02-15 11:41:43

April Flowers for redOrbit.com - Your Universe Online A new genome-wide analysis, led by the University of Chicago Medical Center, searched for evidence of long-lived balancing selection - where the evolutionary process acts not to select the single best adaptation but to maintain genetic variation in a population. The study revealed at least six regions of the genome where humans and chimpanzees share the same combination of genetic variants. The results of this study have been...

Determining Sexual Selection In Extinct Species
2013-01-30 08:11:48

Brett Smith for redOrbit.com - Your Universe Online According to a new study in the journal Trends in Ecology and Evolution, determining if certain extinct animals had sexually selective traits is possible, despite the fact that we cannot observe their behavior. Many animals have sexually selective traits that are used or displayed in pursuit of a mate, male peacocks have their colorful plumage and mallard ducks have a distinct green coloration to their head feathers. Some of these...

Man’s New Best Friend Is A Rat
2012-12-28 10:45:05

Alan McStravick for redOrbit.com — Your Universe Online The dog has been caught unaware by a competitor for man´s affections. And sure, the dog has a strong foothold on its title of ℠Man´s Best Friend´. But this new species angling for the position of top dog and the surreptitious behavior it displays in doing so can only lead one to surmise that this animal is acting, well, like a rat. The reason one might perceive the rat´s march toward domesticity as...


Word of the Day
mundungus
  • A stinking tobacco.
  • Offal; waste animal product; organic matter unfit for consumption.
This word comes from the Spanish 'mondongo,' tripe, entrails.