News tagged with evolutionary time

How rattlesnakes got, and lost, their venom

Millions of years ago, as the snake family tree grew new branches, the ancestor of modern rattlesnakes was endowed with a genetic arsenal of toxic weaponry, including genes for toxins that poison the blood, toxins that damage ...

dateSep 16, 2016 in Plants & Animals
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Smarter brains are blood-thirsty brains

A University of Adelaide-led project has overturned the theory that the evolution of human intelligence was simply related to the size of the brain—but rather linked more closely to the supply of blood to the brain.

dateAug 30, 2016 in Evolution
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'Sleeping dogs' threaten the genome as we age

The genomes of many organisms, humans included, are littered with repetitive sequences of DNA called retrotransposons. In a new "Perspective" in the journal Science, four biologists write that while most retrotransposons ...

dateDec 05, 2014 in Biotechnology
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Why the urge to find 'Nemo' has helped fish diversify

Caring parents foster successful offspring, or so the thinking goes. But for reef fishes, such as Disney's charismatic clownfish, Nemo, the effects of parental care stretch right across evolutionary time and even increase ...

dateJun 12, 2014 in Ecology
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