News tagged with evolutionary time

'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 r ...

Dec 05, 2014
5 / 5 (5) 0

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 ...

Jun 12, 2014
not rated yet 0

When it comes to mammals, how big is too big?

(Phys.org) —Mammals vary enormously in size, from weighing less than a penny to measuring more than three school buses in length. Some groups of mammals have become very large, such as elephants and whales, ...

Jun 14, 2013
3.9 / 5 (7) 2 | with audio podcast

Lessons from cockroaches could inform robotics (w/ video)

Running cockroaches start to recover from being shoved sideways before their dawdling nervous system kicks in to tell their legs what to do, researchers have found. These new insights on how biological systems stabilize could ...

Feb 22, 2013
5 / 5 (4) 0 | with audio podcast

The origins of a genetic switch

Cilia, microscopic whip-like organelles that protrude from the surface of many cell types, are almost ubiquitous. They are present in all eukaryotes—organisms whose cells have a nucleus—and have diversified ...

Jan 02, 2013
5 / 5 (3) 1