In a typical human , the following similarities may be quickly discerned:
The corresponding fingers of each hand (on the OPPOSITE side of the body) are roughly identical in length and shape; the same relationship exists concerning the size and shape of the hands, arms, shoulders, ribs, legs, knees, ankles, feet, toes, eyes, ears, and nostrils.
Additionally, the eyes and ears are located in the same relative positions on both sides of the face. Also, the corresponding teeth in the upper and lower jaw are roughly identical in structure.
What accounts for this symmetry?
God? Coincidence?
2007-08-09
13:56:05
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28 answers
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asked by
Kidd!
6
in
Society & Culture
➔ Religion & Spirituality
Symetry is actually relatively easy to explain. It saves genetic coding space. It would be much simpler to just mirror the code as opposed to recoding the entire side. This would naturally be devoloped by natural selection as these species/lifeforms could not only breed faster but would have a higher likelyhood of successful dual sided mutation.
2007-08-09 14:01:19
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answer #1
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answered by Anonymous
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Even going farther, how did the different sexes develop? Why aren't all asexual. This would be easier for evolution, but maybe it wouldn't as evolution has a problem of mutations, as most are harmful. As far as natural selection, I don't think there was a choice on symmetry. That makes me think of a cartoon in the New Yorker, as far as people dating on Halloween, ...enough said.
I believe it all comes down to a creator.
2007-08-10 01:33:02
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answer #2
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answered by RB 7
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More interesting is how evolution accounts for the asymmetries. Your head is lopsided and bulges more over one eye than the other, the eyes are not the same size, one ear is located higher than the other, we nave to small of a jaw to fit all of our teeth into and often need our wisdom teeth extracted because of it. in most people the right leg is longer than the left leg....
....I think you are just using a made up argument about symmetry and suggest you actually check your facts instead of just believing what your preacher tells you.
2007-08-09 14:05:38
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answer #3
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answered by ? 5
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All living things have symmetry. The most commonly seen body style amongst vertebrates is that of the tetrapod, which include all mammals, birds, amphibians and reptiles. Some animal groups, such as the cetaceans, bats and most birds have been modified (e.g. front limbs become wings or flippers) but nevertheless, they are still tetrapods.
atheist
2007-08-09 14:09:59
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answer #4
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answered by AuroraDawn 7
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Whether you believe it comes from God or Evolution, you must admit it's present because it's beneficial. How is it beneficial? It takes less DNA information to be symmetric. We share similar base DNA win all life on Earth. Nearly all animals are symmetric, so it must be beneficial in nearly every environmental niche. It's only one plane of symmetry, a vertical center plane that goes between your eyes. It must not be good to be symmetric front to back for most animals. Most animals have a main direction of movement. Probably a connection there.
2007-08-09 14:05:25
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answer #5
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answered by Anonymous
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Did you know that children respond more positively to women with bilaterally symmetrical faces, rather than asymmetrical faces?
Perhaps this is a key to attractiveness within a species... both human and nonhuman. Therefore, the more attractive or "symmetrical" a specimen is, the more likely it is to reproduce, and thus its genetics are passed on, making for symmetrical offspring.
Just a thought.
2007-08-09 14:05:53
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answer #6
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answered by bchlis 2
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Well, I'm think walking around all lopsided wouldn't be very effective for hunting. Walking with a limp, awkward gait, one hand dragging on the ground the other up around your shoulders.
What purpose would that serve, certainly wouldn't be the most energy efficient for movement either. You would soon be caught by another animal, or terribly handicapped when it comes to hunting ...
That is what natural selection means... the best form for the best possible job...to ensure survival..
2007-08-09 14:02:19
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answer #7
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answered by Sapere Aude 5
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Because a monkey with a gimp leg can't run away from predators.
But in contrast many crustaceons have different length and size forearms to handle different tasks.
2007-08-09 14:14:23
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answer #8
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answered by Dark-River 6
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What accounts for the fact that 90% of the GI tract is asymmetrical (stomach, pancreas, liver, gall bladder), and that the heart is off-center (and gee, there's only one of them)? And just where DOES that pesky appendix fit in?
God? Coincidence?
2007-08-09 14:41:14
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answer #9
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answered by Nandina (Bunny Slipper Goddess) 7
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It takes less genetic information to make things symmetrical. That is why most animals have symmetry. It would only be problematic to the idea of evolution if we were symmetrical, and the other mammals weren't
And there is plenty that isn't if you look around your body..
2007-08-09 14:11:01
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answer #10
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answered by Anonymous
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