Difference between revisions of "Homology"
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| + | == Creationist Scientist View == | ||
| + | Creationist scientist assert the the following: the [[homology]] argument is not a legitimate argument for the [[Theory of evolution|evolutionary view]]; the homology argument has problems; and homolgy is best explained by creation according to a common plan. <ref>http://www.answersingenesis.org/home/area/cfol/ch1-homology.asp</ref><ref>http://www.answersingenesis.org/creation/v14/i2/homology.asp</ref><ref>http://www.answersingenesis.org/tj/v15/i1/homology.asp</ref> | ||
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| + | == Evolutionary View == | ||
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Biologists have noted that many (apparently unrelated) species of animals share common characteristics: | Biologists have noted that many (apparently unrelated) species of animals share common characteristics: | ||
Revision as of 00:53, March 31, 2007
Creationist Scientist View
Creationist scientist assert the the following: the homology argument is not a legitimate argument for the evolutionary view; the homology argument has problems; and homolgy is best explained by creation according to a common plan. [1][2][3]
Evolutionary View
Biologists have noted that many (apparently unrelated) species of animals share common characteristics:
- Dolphins, oceanic sharks, tuna fish, and the extinct ichthyosaurs, which all share a streamlined fishlike form, for their swift swimming predatory lifestyle. Tuna, ichthyosaurs, and certain oceanic sharks even have elevated body temperatures, just like the warm-blooded dolphin, supposedly to facilitate their high levels of activity, even though fish and reptiles are otherwise almost entirely cold-blooded.
- Hedgehogs, echidnas and certain types of Madagascan tenrecs - though widely separated geographically, all have a coat of protective spines and a prehensile snout ideal for snuffling for invertebrates.
- Penguins of the Southern hemisphere and auks of the Northern hemisphere both live by chasing fish underwater, using their short stubby wings to fly beneath the waves.
- The eye of an octopus and human - both contain a retina, a cornea, an iris, a lens and are fluid filled. Some differences do exist - the photo receptors in the human are 'backwards' - catching light reflected off the back of the retina. Additionally, the eye of an octopus is a modification of the skin, while the eye of a human is an extension of the brain.[4][5]
Darwin found evidence for his theory in examples of "convergent evolution", when (as he surmised) the same "adaptations" have "evolved independently" in different lineages of species under similar selection pressures. [6]
References
- ↑ http://www.answersingenesis.org/home/area/cfol/ch1-homology.asp
- ↑ http://www.answersingenesis.org/creation/v14/i2/homology.asp
- ↑ http://www.answersingenesis.org/tj/v15/i1/homology.asp
- ↑ octopus eye
- ↑ Comparative Analysis of Gene Expression for Convergent Evolution of Camera Eye Between Octopus and Human
- ↑ Instant Expert: Evolution
