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1997-02-27 00:00:00 - Re: Why was Quinn's female double shorter than him? - (Bill Bickel <bbickel@cris.com>)


Burr wrote: > > As the professor said, the difference is only that of a X chromosome. > Shouldn't that mean that they would be the same height? More logically, they should both be in the same height percentile: say, the 60th percentile (taller than 60% of the male population) for Quinn, and the 60th percentile for his counterpart. Women are, on average, shorter... Bill Bickel

1997-02-27 00:00:00 - Re: Why was Quinn's female double shorter than him? - (al51@cornell.edu)


No, height is a sex-influenced charachteristic, otherwise men and women would have the same average heights. In article <01bc24e2$6edcbc60$887014cb@Burr.cynergy.com.au>, "Burr" <burres@cynergy.com.au> wrote: >As the professor said, the difference is only that of a X chromosome. >Shouldn't that mean that they would be the same height? > >Gumby

1997-02-27 00:00:00 - Why was Quinn's female double shorter than him? - (Burr <burres@cynergy.com.au>)


As the professor said, the difference is only that of a X chromosome. Shouldn't that mean that they would be the same height? Gumby

1997-02-27 00:00:00 - Re: Why was Quinn's female double shorter than him? - (TDJ <TDEJA@osc.state.ny.us>)


"Burr" <burres@cynergy.com.au> wrote: >As the professor said, the difference is only that of a X chromosome. >Shouldn't that mean that they would be the same height? Not neccesarily--there are several factors that could affect a person's growth and appearance. Improper nutrition or impurities in the air might hinder growth in such a way. The idea of the air being polluted enough to affect this change seems plausible, what with the world being so reckless when it comes to obtaining resources. With the exception of that X chromosome, Logan is identical, but the way she was raised might create the variance we see. -- <*><*><*><*><*><*><*><*><*><*><*><*><*><*><*><*> It's tough to be somebody. | TDJ It's tough to keep from falling apart. | Tdeja@OSC.STATE.NY.US Up here on rehab mountain, | Cause life's just too boring... we all learn these things by heart. | --Warren Zevon

1997-03-01 00:00:00 - Re: Why was Quinn's female double shorter than him? - (charris@bu.edu)


Burr (burres@cynergy.com.au) wrote: : As the professor said, the difference is only that of a X chromosome. : Shouldn't that mean that they would be the same height? You appear to have the following model of how organisms develop: genes --> (cause) physical attributes. The physical attribute of height (like every other physical characteristic) is only partially specified by information in DNA. Quinn's double could be either smaller or taller than he is depending on nutrition and physical stress during development. The physical similarity of doubles in Sliders is annoying. If the two worlds split off after birth, then a Slider and her twin should show the same physical variety one observes in identical twins. If the worlds split *after* conception but *before* the slider was born, then the period of gestation will be different, and so prenatal details can cause the double to be different (eg, did mother have adequate nutrition), which means *less* similarity than that found between identical twins. Now we come upon a real problem... Imagine you are a slider. What if the alternative world and Earth prime became different before you were born, how could you ever find a double on that alternative earth? You couldn't. Why not? Because of this: How likely is it that the ovum released from your mother's fallopian tube is going to be the same ovum released by your mother on the alternative earth? How likely is it that the same sperm is going to successfully penetrate that egg? (Remember that millions of sperm are released on each ejaculation.) Perhaps the sperm that created you was your father's 3 thousandth ejaculation of his life, but on earth alternative, he had gotten in a few hundred more ejaculations by the time he squirted the one into your Mom that happened to cause a conception... and so on. Conclusion: doubles can only exist if the the worlds were identical up to the time of conception. Now, the fact that doubles do exist in other worlds (on Sliders) means that the "parallel" worlds are not really parallel, but instead "split off" from Earth prime at different times, as was discussed when splitting came up some threads ago. Back to genes: The pathway from genes to fully mature organism is one in which information in the role of DNA is restricted to orchestrating protein synthesis and cell division. How the organism turns out depends on interactions between cells. For example, the Y chromosome is informationally pretty impoverished. It has mainly one important thing: it codes for testes-producing factor, which needs to be present for the testes to develop. Once the testes develop, testosterone will circulate prenatally at about 10 weeks. Circulating testosterone causes the external male genitals to develop. (You could also cause male genitals to develop, even in an XX individual, by artificially introducing testosterone during the right period in prenatal development.) Cheers, Cathy =========== Catherine Harris, Assistant Professor, Department of Psychology, Boston University, 64 Cummington St., Boston, MA 02215 (617) 353-2956 http://web.bu.edu/PSYCH/faculty/charris/ charris@bu.edu

1997-03-01 00:00:00 - Re: Why was Quinn's female double shorter than him? - (Matt Hutaff <hutaff@scf.usc.edu>)


Bryan Beals wrote, and badly at that: Duh! Basic Genetics! The X and Y Do more than genter. The Influnece outher Chr shuh and height and hair loss. That's why women are on the average shorter that men. Also the genetic combo that causes men not to louse there hair causes hail loss in woman and vice verca. Bryan --- Why not give the simple and rational explanation that women are, for the most part, shorter than men? It has nothing to do with the world, women are just shorter. Period. -- ==================== Matt Hutaff ==================== hutaff@scf.usc.edu University of Southern California

1997-03-01 00:00:00 - Re: Why was Quinn's female double shorter than him? - (Bryan Beals <bbeals@pacbell.net>)


Duh! Basic Genetics! The X and Y Do more than genter. The Influnece outher Chr shuh and height and hair loss. Thats why women are on the avrage shorter that men. Also the gentic combo that causes men not to louse there hair causes hail loss in woman and vice verca. Bryan Burr <burres@cynergy.com.au> wrote in article <01bc24e2$6edcbc60$887014cb@Burr.cynergy.com.au>... > As the professor said, the difference is only that of a X chromosome. > Shouldn't that mean that they would be the same height? > > Gumby >

1997-03-02 00:00:00 - Re: Why was Quinn's female double shorter than him? - (RossD/SparkMan <rdickinson@monmouth.com>)


Is this Health Class or something. Some kids might not wanna read that kinda stuff right about now.

1997-03-03 00:00:00 - Re: Why was Quinn's female double shorter than him? - (ayla@astro.ocis.temple.edu)


> The X and Y Do more than genter. The Influnece outher Chr shuh and > height and hair loss. That's why women are on the average shorter that > men. Also the genetic combo that causes men not to louse there hair > causes hail loss in woman and vice verca. > > Bryan > > --- > Why not give the simple and rational explanation that women are, for the > most part, shorter than men? It has nothing to do with the world, women > are just shorter. Period. > -- > ==================== > Matt Hutaff > ==================== > hutaff@scf.usc.edu > University of Southern California About this height thing: This height thing is not gender oriented. I am almost 6ft. I am also friends with many women from Germany and they are way taller than me. In fact, when they come to visit, they comment on how short American men in general are. As for the X/Y thing here is the basic way that I see it. Height is determined by a combination of alleles for genes encoding height. Since you have two sets of each chromosome, you have two sets of height genes. So IF the genes for height are located on the sex chromosomes, then and XX and XY combinations would have different phenotypes (physical appearance). But if it is located on an autosomal (non-sex) chromosome it wouldn't matter. Beth -- Beth Ann Sipple Dept. of Biology

1997-03-03 00:00:00 - Re: Why was Quinn's female double shorter than him? - (Adrian Appleberry <xfiles@patriotcom.com>)


> As for the X/Y thing here is the basic way that I see it. Height is > determined by a combination of alleles for genes encoding height. Since > you have two sets of each chromosome, you have two sets of height genes. > So IF the genes for height are located on the sex chromosomes, then and XX > and XY combinations would have different phenotypes (physical > appearance). But if it is located on an autosomal (non-sex) chromosome it > wouldn't matter. The only way I can see to prove where it is for sure is to find two sets of half DNA strands (two identically encoded eggs and two identically encoded sperm except one X and one Y) and see what happens when they are fertilized and grow to maturity. I think height is also influenced by nutritional factors, and other environmental factors as well.... so in order to achieve success, those would also have to be in the Control. Quinn, however is well over 6 feet tall, which is unusual for American women, and a lot of men for that matter (average height for an American male is 5'10.5 or so"

1997-03-04 00:00:00 - Re: Why was Quinn's female double shorter than him? - ("Brannon \"Ben\" Boren" <brannonb@u.washington.edu>)


Adrian Appleberry <xfiles@patriotcom.com> wrote: > I think height is also influenced by nutritional factors, and other > environmental factors as well.... so in order to achieve success, those > would also have to be in the Control. Well, maybe I missed it, but I've been waiting and waiting and nobody has yet brought up the biggest factor here. Even if they are genetically identical, Logan's female anatomy is going to cause her to be smaller in stature than Quinn. This actually has nothing to do with "height" genes. It has to do with many other genes that have no direct effect on height, but whose products influence it - primarily hormones. Hormone production varies significantly between males and females. The fact that Logan is female necessitates a very different physiology, and that physiology affects secondary factors such as muscle and bone growth. Ben ------------------------------------------------------------------ * Brannon "Ben" Boren ** "Would you _mind_ not * * brannonb@u.washington.edu ** shooting at the * * University of Washington ** Thermonuclear Weapons?" * * Department of Chemistry ** -Broken Arrow * ------------------------------------------------------------------

1997-03-04 00:00:00 - Re: Why was Quinn's female double shorter than him? - (al51@cornell.edu)


I beg of you, tell me you are only a freshman in the dept of biology. If you are a professor then we are all doomed. In article <ayla-0303971629140001@fishnet.bio.temple.edu>, ayla@astro.ocis.temple.edu (Beth Ann Sipple) wrote: >About this height thing: This height thing is not gender oriented. I am >almost 6ft. I am also friends with many women from Germany and they are >way taller than me. In fact, when they come to visit, they comment on how >short American men in general are. There are also many women stronger than many men but on average (average folks, not stereotype) women are shorter and not as strong as men. Women also have a longer lifespan on average than men but this doesn't mean you can't find a man older than a particular woman. It is rare to find a brother who is shorter than his sister when both have reached full growth and they share on average just under 50% of their genes (The Y he has and she doesn't makes it just under). >As for the X/Y thing here is the basic way that I see it. Height is >determined by a combination of alleles for genes encoding height. Since >you have two sets of each chromosome, you have two sets of height genes. >So IF the genes for height are located on the sex chromosomes, then and XX >and XY combinations would have different phenotypes (physical >appearance). But if it is located on an autosomal (non-sex) chromosome it >wouldn't matter. Again I beg you to tell me you are just starting your education. Many, many characteristics are influenced by gender even though they are not on the X or Y chromosome. In fact the only purpose of the Y-chromosome is as an activator for genes on other chromosomes. So it certainly can matter to phenotypes even if the genes are not on the sex chromosomes.

1997-03-07 00:00:00 - Re: Why was Quinn's female double shorter than him? - (jabblab@yoyo.cc.monash.edu.au)


On 27 Feb 1997 20:14:40 GMT, "Burr" <burres@cynergy.com.au> wrote: >As the professor said, the difference is only that of a X chromosome. >Shouldn't that mean that they would be the same height? i am no doctor or scientist but doesn't male and female growth differ? If that's not the case then it's probably because being the good boy quinn is he probably has been eating his weaties.