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The Legend ?
- Thread starter twinc
- Start date
In essence, no four legs evolved into two.
All mammals and birds, for example, have four legs. Its just that in the case of humans and other apes, we call our front legs "arms", and in the case of birds, we call them "wings".
But in broad detail, arms and wings retain many of the same characteristics as the hind legs.
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The Hox gene seems to control that aspect of things, and symmetry seems to play a role in the most likely outcomes. Keep in mind that 1, 3 and five legged options might actually occur, but if there is no benefit in terms of survival, or a hindrance to survival, it wouldn't flourish.
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some insects etc have more than four legs and if four legs are faster than two then six or more should be even faster - is this not intelligent design for with one leg we would be hopping mad,with three like a stool we would be coming and going nowhere and with five we would be forever tripping up - twinc
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o.k.
It's just that when you were talking of four legs and two legs (and three and one), I presumed you were thinking in terms of animals such as fish, amphibians, mammals, birds etc.
In the case of insects, go back to Michael's post. And in the case of why even numbers of legs - go back to Michael's post.
Once symmetry evolved then pairing would be the result - namely 2,4, 6, 8 .... legs. At least that's my understanding of it.
twinc said:
What makes you think that an omnipotent, supernatural designer couldn't design an organism with three legs that was not superior to an organism with 6 legs? Are you suggesting that the omnipotent, supernatural designer is limited in some ways?
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Bipedal vertebrates still have four limbs. With that kept in mind, what does that seem to suggest about your hypothesis that there could be one- or three-legged transitions?
(Not being sarcastic or rude. As an education major, I have a habit with answering questions with questions!)
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jayem
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Being able to ambulate while gathering food with 2 extremities would have some survival advantage. Also, having 2 limbs always available to use tools is one reason humans built a complex civilization and other primates didn't. But bipedalism has some drawbacks. You can't run as fast as with 4 legs. And there are much higher forces on the spine. That's probably why back problems are so common. There's no selection pressure to favor more robust intervetebral discs, and stronger spinal muscles and ligaments before the child rearing years.
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