Search found 10 matches

by immunogoblin
Sun Aug 26, 2012 4:43 pm
Forum: Evolution
Topic: Can you think of an evolutionary reason for this?
Replies: 10
Views: 19235

Can you think of an evolutionary reason for this?

I'm reading an article on the growing rate of early puberty amongst girls, here's an excerpt: "Girls who from an early age grow up in homes without their biological fathers are twice as likely to go into puberty younger as girls who grow up with both parents.Some studies show that the presence ...
by immunogoblin
Sun Aug 26, 2012 4:32 pm
Forum: Human Biology
Topic: Is such woman body reasonable?
Replies: 4
Views: 4957

http://www.cbsnews.com/8301-504763_162- ... 91704.html

not scientific but i thought i'd throw it out there.

"She likely would not menstruate... she'd have to walk on all fours due to her proportions."
by immunogoblin
Tue Jul 24, 2012 10:37 pm
Forum: Evolution
Topic: I don't understand fitness landscapes :(
Replies: 7
Views: 8980

Re: I don't understand fitness landscapes :(

Or does that just mean that it's easier for the pathogen (in this case the virus) to be transmitted to a new species when the fitness valley is shallow?

I hope I'm understanding this correctly.

Thanks again
Ig
by immunogoblin
Tue Jul 24, 2012 9:43 pm
Forum: Evolution
Topic: I don't understand fitness landscapes :(
Replies: 7
Views: 8980

Thanks Rap, I'm still left wondering about steepness though. Here's a picture of what I mean: http://imageshack.us/photo/my-images/71 ... capeu.png/

What's the difference between the two?
by immunogoblin
Sun Jun 03, 2012 4:18 am
Forum: Evolution
Topic: Perception and Evolution
Replies: 14
Views: 16664

Re: Perception and Evolution

@JorgeLobo: Can't acquired characters not influence evolution in any way? By altering the environment an organism adapts to? Nothing immediate, and I can't imagine on the scale Rap is talking about... I come from a long line of people who were pretty dedicated to survival and reproduction haha nice.
by immunogoblin
Sun Jun 03, 2012 4:01 am
Forum: Evolution
Topic: I don't understand fitness landscapes :(
Replies: 7
Views: 8980

I don't understand fitness landscapes :(

What does how steep a peak is on a fitness landscape represent? What does that steepness mean for an organism whose genotype is at the bottom of that peak? Can you give me an example?

Thanks!
by immunogoblin
Sun Jun 03, 2012 3:58 am
Forum: Evolution
Topic: Excluding One of Darwin's Postulates: What Would Happen?
Replies: 4
Views: 5401

Re: Excluding One of Darwin's Postulates: What Would Happen?

Speaking of genetic drift, I've got another question: Can genetic drift cause adaptive evolution? A presentation I'm reading attributes adaptive evolution to the mechanism of natural selection and non-adaptive (or neutral) evolution to genetic drift. It says that drift can lead to non-adaptive evolu...
by immunogoblin
Fri Jun 01, 2012 8:52 pm
Forum: Evolution
Topic: Excluding One of Darwin's Postulates: What Would Happen?
Replies: 4
Views: 5401

Re: Excluding One of Darwin's Postulates: What Would Happen?

@JorgeLobo: For sure, I definitely didn't mean to imply that. Need to work on my precision in writing!

@AstraSequi: Genetic drift! Of course! Why on earth did I forget about that?!?

Thank you both for the insight.

Cheers,
Ig
by immunogoblin
Sat May 26, 2012 5:39 am
Forum: Evolution
Topic: Excluding One of Darwin's Postulates: What Would Happen?
Replies: 4
Views: 5401

Excluding One of Darwin's Postulates: What Would Happen?

Hi everyone, We know that the result of meeting all four of Darwin's postulates is evolution by natural selection. So I got to wondering... If, in a theoretical population, the first 3 of Darwin's postulates were met, but instead of "4. Survival and reproduction of individuals are not random. &...