Search found 1276 matches

by Darby
Tue Feb 25, 2014 5:48 pm
Forum: Human Biology
Topic: Please answer: Group selection and Sociobiology
Replies: 1
Views: 3317

The idea that evolution could be applied to groups became tied to the idea that Western culture could suppress local cultures, and it was just a natural process. The concept became politically very incorrect. Rejecting group selection means saying that, in colonial species, the interactions and subg...
by Darby
Sun Feb 23, 2014 12:03 am
Forum: Evolution
Topic: Is incest avoidance selected for?
Replies: 2
Views: 3185

Mice use pheromones to help select the least-related potential mates.
by Darby
Wed Dec 25, 2013 2:30 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19705

The article gives a lot of background on general gluconeogenesis, which is why I tagged it. And apparently, enzymes involved in glycogen transformation inhibit gluconeogenesis...or maybe it's intermediate products...
by Darby
Wed Dec 25, 2013 2:27 pm
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 13278

At the atomic level, there is LOTS of space...they're just following the odds, really - if the concentrations are 5% and 70%, for every 5 particles headed one way, there's 70 headed the other.
by Darby
Fri Dec 20, 2013 5:48 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19705

I assumed that glycogen reserves would be enough except for extreme conditions, and that is sort of true...

Ths has a decent overview -

http://care.diabetesjournals.org/content/24/2/382.long
by Darby
Fri Dec 20, 2013 3:14 pm
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 13278

Think about a crowd, with women and men, randomly moving across a sidewalk from one side of a park to the other. If the movement is random, men will gradually diffuse along their gradient, women along theirs, and even though they are all "people," the process still works...
by Darby
Sat Dec 14, 2013 10:03 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19705

Isn't gluconeogenesis SYNTHESIS of glucose, rather than breakdown of glycogen? I know that predators with almost no carb sources do that, but it seems that it would require pretty extreme conditions to kick in for human...
by Darby
Fri Dec 13, 2013 3:22 pm
Forum: Zoology Discussion
Topic: Is this a wolf??
Replies: 8
Views: 7206

Yeah, coyotes' range is almost the entirety of N America. And how does one gauge the size with no real benchmarks in the photos?

It is a little bulky for a coyote. Stray/ feral dog is the best guess here.
by Darby
Mon Dec 02, 2013 3:43 am
Forum: Zoology Discussion
Topic: Is this a wolf??
Replies: 8
Views: 7206

It could be a melanistic coyote...
by Darby
Tue Nov 26, 2013 1:45 pm
Forum: Evolution
Topic: Speciation and Evolution
Replies: 6
Views: 11237

The first question, there's no way to tell between C and D - a month is enough time to starve all of the birds, and why would we be sure that ANY individuals could make the shift from cactus to orchid at any point in time? There are two possible answers to the second one as well, since the "fos...
by Darby
Tue Nov 26, 2013 1:39 pm
Forum: Evolution
Topic: Natural Selection
Replies: 2
Views: 5238

Sounds good. The question kind of stretches the term of artificial selection, but it's still the best choice.
by Darby
Mon Nov 18, 2013 2:01 pm
Forum: Human Biology
Topic: Turner Syndrome and X chromosomes
Replies: 1
Views: 2585

The inactivation isn't happening at the very beginning of embryological development.

http://web.udl.es/usuaris/e4650869/doce ... moInac.pdf