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homologous vs analogous

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homologous vs analogous

Postby bionewbie » Sun Apr 09, 2006 12:35 am

Would somebody mind explaining to me the differences between homologous vs analogous parts? I have a lot of trouble with understanding the connection between the two terms.
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Postby kiekyon » Sun Apr 09, 2006 1:39 am

analogous=similar in function but not evolutionary origin
homologous=similar in function and in evolutionary origin
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Postby plasmidmap » Sun Apr 09, 2006 1:43 am

Homologous traits are similar because they share a common evolutionary origin (like the leg of a horse and the leg of a donkey).

Analogous traits are similar because they are used similarily but were developed separately and do not have a common evolutionary origin (like an insect wing and a bat wing). They are the product of convergent evolution.
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Postby bionewbie » Sun Apr 09, 2006 2:18 am

this may sound really silly, but how would you know that they are part of the evolutionary history or share common ancestors?
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Postby mith » Sun Apr 09, 2006 4:57 am

very carefully :)
There's actually minute differences that you can find
for example megaphylls and microphylls are two types of "leaf" structures. Look it up on wikipedia
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