Posted on 03/27/2011 12:09:25 PM PDT by decimon
Yes, as a matter of fact, *I* do.
It means you'd better answer correctly when your wife asks "Does this outfit make my butt look big?" or -- you'll either get killed outright, or else never get a chance to propagate your jeans genes.
Darwin award, indeed.
Cheers!
gotta watch it, grey .. some people have NO sense of humor.
Hmmmmm, so the creationist prediction that stasis is very much underrated is......accurate?
That's what the "fittest" means: those most fit to survive under the circumstances. This "fitness" may be a genetic predisposition, innate qualities, size, color, etc., or even something learned...but whoever or whatever has it will have a greater chance to survive under specific circumstances.
Variation within a populations is a measure of the fitness of a population, not just an individual. A stress that could wipe out a hypothetical “super fit ultimate competitor” bacterial population with almost no variation would only decimate a population with more variations, because some variations would be or become resistant to the stress.
Well, yeah, but that’s how their society worked.
I recently read about a compilation of all known examples of pre-Alexander Greek art. In those which were intended to represent the ideal of beauty, young boys/men outnumbered females by 14:1.
Which is as if you walked down the magazine rack today and 95% of the covers had young males on them rather than young females, instead of the other way around. Sex sold in ancient Greece, as today, but it was a very different kind of sex. Obviously changes a society quite dramatically.
This changed later, BTW. The Hellenistic Greeks and the Romans had much more appreciation for female beauty.
Another Greek ephebophile issue.
The high point of Greek culture and art coincided exactly with the maximum popularity of ephebophilia.
Which makes it pretty unlikely their addiction to homo sex caused their eventual collapse.
The common conservative belief that Greek/Roman homosex caused their societies to collapse does not, unfortunately, fit the timeline.
LOL! I do have a sense of humor. And grey is correct, for the term “fit” doesn’t mean the biggest, meanest ‘badass’ - it means those best able, by any means, to survive.
And you don't get chromosomes unchanged from a grandparent or great grandparent. The chromosomes you inherited from mom are almost exactly a 50/50 inheritance split between her mom and dad - and the chromosomes you inherited from dad are almost exactly a 50/50 inheritance split between his mom and dad.
Recombination frequency is measure in “centimorgans” which correspond to a % chance that a crossover event will happen between two chromosomal markers (mixing and matching mom and dad's DNA along the chromosome to make reproductive cells). It is about a 1% chance to have a cross over every 15,000 nucleotides.
The human genome is on 46 chromosomes and consists of 3 billion base pairs. That makes the scale of 15,000 nucleotides pretty small.
Correct and amend my remarks....
“and the chromosomes you inherited from dad are almost exactly a 50/50 inheritance split between his mom and dad.”
Other than the Y chromosome in males - that you get from your father much the same as he got it from his father; with only a small section that does recombination with the X chromosome he got from his mother.
..... um.......
And of course the X chromosome in women that they got from their father; that also only underwent a very small amount of recombination with the Y and is therefore almost exactly what he got from his mother.
A fitness partition function -- now that's an odd thought.
Cheers!
The attraction to young men did not "cause" a demographic death spiral of the type Mark Steyn laments in America Alone (a possible "cause/effect") but it might have "caused" God to get pissed at their culture and arrange for them to get their ass kicked.
(E.g. think of Old Testament judgements, there was often a time lag baked in. cf Jeremiah 44.)
Cheers!
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There is no need to find an “integer solution to one quarter of 46” because chromosomes DO NOT PASS DOWN INTACT as an “integer”.
Recombination during meiosis, also called chromosomal crossover, makes sure that no mother or father passes on, intact, a copy of their mothers chromosome 21 but their fathers chromosome 20, etc. Each and every chromosome (excepting the X and Y as I previously mentioned) is a 50/50 mix of grandparent DNA when passed down.
No, it isn’t. That’s why I didn’t respond to that part.
http://biology.clc.uc.edu/courses/bio104/meiosis.htm
“Meiosis is a special type of cell division that produces gametes with half as many chromosomes. The opposite process would be syngamy or fertilization, which is the union of the egg and sperm to restore the 2n number.”
This is familiar to everyone who ever saw a cell nucleus in division, but these gametes are the basis for sexual reproduction.
Genetic info can and does cross over, but it’s similar to mutation rates, with a higher frequency — still small. For all practical purposes, the integer model shown above is correct. Meiosis isn’t like shuffling all the genes on every chromosome or blending out the differences.
http://en.wikipedia.org/wiki/Recombinant_frequency
“At the beginning of normal meiosis, a chromosome pair (made up of a chromosome from the mother and a chromosome from the father) intertwine and exchange sections or fragments of chromosome. The pair then breaks apart to form two chromosomes with a new combination of genes that differs from the combination supplied by the parents. Through this process of recombining genes, organisms can produce offspring with new combinations of maternal and paternal traits that may contribute to or enhance survival.”
The human genome is 3 billion base pairs.
How many crossover events would you expect during one round of recombination of the “average” chromosome?
Chromosomes are from 50,000,000 to 300,000,000 base pairs. So the smallest would have a 1% chance * (300,000,000/15,000 = 20,000).
A 1% chance 20,000 times is going to be a significant number of crossover events - resulting in the chromosome being a mix of paternal and maternal DNA.
Every time. Not as rare as a mutation.
As such it is immaterial to talk of finding an integer solution to 46/4 to determine grand-parental contribution to an individual. It just doesn't go down like that at all.
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