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maikeru's Profile
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Posts I've Made
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In Topic: Red Blood Cells
15 January 2011 - 05:23 PM
HydrogenBond, on 15 January 2011 - 07:24 AM, said:Selective advantage is dependent on the environment. If you change the environment the conditions for advantage will change. For example, extra thick fur may be an advantage in the tundra, but may not create an advantage at the equator. The extra thick fur is only one variable among dozens of other randomly changing variables. It may define fitness in an environment, but not necessarily overall fitness in terms of efficiency.
For an example, if you look at the peacock, natural selection and breeding favors males with large colorful feathers. Theoretically, even a peacock with regressive internal body systems, as long as he can look good and sing the right song, he will have selective advantage. The peacock is not suitable for making sure the most fit genes move forward through natural selection. Yet if does well since in his case natural selection is more of a secondary variable.
If there is enough internal checks and balances, natural selection can be based on a show of color.
When it comes to evolution, efficiency and perfection are relative. -
In Topic: Red Blood Cells
15 January 2011 - 02:20 AM
HydrogenBond, on 13 January 2011 - 07:27 PM, said:If there was a fully random change within all the genes, more can wrong than right, since even important systems would be free game for bad choices. Take any enzyme and tell me how many ways to make it worse and how many ways to make it better? Which has more options?
It is "free game" and "open," but in more ways than you realize. Evolution has a guiding hand which often takes care of "wrong" choices (note that there really is no "wrong" or "right" in evolution, I'm using the terminology to simplify the discussion)--we call it Natural Selection. Individuals (and their collective genetic package) which acquire lethal or too many detrimental mutations have natural selection selecting against them, and hence are less likely to be able to reproduce and pass their detrimental mutations onto future generations. So long as natural selection applies pressure to shape the gene pool of the population through the generations, your supposition is basically moot. In fact, because of natural selection and other factors at play in evolution, this creates a standard for surviving organisms to be well adapted, and thus increasingly successful, at what they do, which are all things reproduction, survival, and transmission and multiplication of their "fit" genes. The end result is a population of individuals carrying genes with mutations/variation who have more right than wrong. -
In Topic: my TP experiment
13 January 2011 - 08:40 PM
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In Topic: Red Blood Cells
13 January 2011 - 08:31 PM
HydrogenBond, on 09 January 2011 - 06:39 AM, said:When cells undergo mitosis, the DNA is taken off-line. Without the cell body, the DNA would remain off-line. Since the DNA is off-line, during mitosis, is this an aspect of the cell cycle when the cell is dead, since the DNA is more of a passive variable dependent on other factors?
Forward poses the idea that the DNA, might be able to alter the cell body before it goes off-line. The cell body would then continue in its characteristic autonomous fashion, but having been modified, result in its own dumbbell shape, which could then allow the cell bodies to swap genes.
Please acquaint yourself with a biology 101 textbook. -
In Topic: Red Blood Cells
13 January 2011 - 08:24 PM
Turtle, on 01 January 2011 - 12:09 AM, said:
Comments
maikeru
21 Aug 2010 - 17:51URIEL 13
20 Aug 2010 - 15:40see my posts on Terra Preta,
http://www.allotments-uk.com/forum/topic.asp?TOPIC_ID=7289&whichpage=8
Uriel
maikeru
09 Aug 2010 - 07:19lemit
08 Aug 2010 - 23:04maikeru
31 Dec 2009 - 03:41pamela
30 Dec 2009 - 17:56maikeru
01 Nov 2009 - 12:27lemit
29 Oct 2009 - 20:35maikeru
25 Apr 2008 - 20:01DougF
25 Apr 2008 - 10:06maikeru
11 Apr 2008 - 23:44Turtle
05 Apr 2008 - 16:14InfiniteNow
05 Apr 2008 - 15:41