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What Do You Get When You Cross a Lion with a Tiger?

A liger, that’s what.  No kidding: you get a big cat with a mane and faint stripes that likes to play in the water.  National Geographic News has a special article, with photos, about ligers. This is offered without much comment, just for those who want to learn about something unusual in the animal kingdom, […]

What Is Really Known About the Genetic Basis of Evolution?

Now that the genomes of a variety of plants and animals have been published, is there a clear picture of evolution emerging?  Sean Carroll (Howard Hughes Medical Institute) wrote a review in PLoS Biology,1 in which he explored the current thinking about the evolution of anatomy at the genetic level.  The thing to watch for […]

More Evidence the Molecular Clock is Broken

“We live in interesting times,” grinned David Penny in Nature,1 reporting on how estimates of evolutionary past based on comparative genomics (the molecular clock) is producing confusing results.  Apparently, evolutionary geneticists are going to have to make use of the theory of relativity – i.e., that how fast the clock ticks depends on the viewpoint […]

The Death of the Concept of “Junk DNA”

“God don’t make no junk” has been a slogan for the self-esteem movement, and now no less than Science Now is providing support at the genetic level.  “Don’t call it junk” the article announces, indicating that stretches of non-coding DNA are apparently not useless regions of material as previously believed, but vital to the regulation […]

Cell Wonders Accelerate

Scientific papers on cell biology continue to uncover amazing things as techniques improve to peer into the workings of these units of life.  Here are our Top Ten from the last few weeks: Immunity Tunes:  A press release from Johns Hopkins talked about how, unlike other cells, immune cells undergo a “dizzying loop of activity” […]

Descendants Can Overcome Parental Mutations

Bad genes from both parents may not spell doom in all cases.  Scientists at Purdue University found that if two parents have bad mutations, the child can sometimes reconstruct the correct gene from the grandparents.  “Our genetic training tells us that’s just not possible,” said Bob Pruitt, co-researcher on the team that ran the experiment […]
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