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Author Topic: Why do snail shells follow a Fibonacci sequence?  (Read 9163 times)

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Why do snail shells follow a Fibonacci sequence?
« on: 08/12/2009 00:25:04 »
The coils of a snail shell apparently follow a Fibonacci sequence. Why?
« Last Edit: 16/12/2009 19:55:07 by chris »


 

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Offline RD

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Re: Why do snail shells follow a Fibonacci sequence?
« Reply #2 on: 09/12/2009 06:16:38 »
"has anyone noticed that the coil of a snails shell" ... is right or left handed ...

Quote
The coil of a snail shell can be either right-handed (dextral) or left-handed (sinistral), based on whether the shell spirals out clockwise or counterclockwise when viewed from above. Most species are composed entirely of individuals that are one or the other type; in exceptional cases, populations may differ in their handedness, or chirality, but within a single population, all individuals tend to be alike. This makes sense, since the mechanics of reproduction are harder between two individuals of opposite chirality (their genitalia are also reversed), reducing the likelihood that they will successfully mate and produce offspring. Over time, therefore, the rarer type will become rarer and rarer until it goes extinct.
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1182695
« Last Edit: 09/12/2009 06:18:38 by RD »
 

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Re: Why do snail shells follow a Fibonacci sequence?
« Reply #3 on: 15/12/2009 03:22:44 »
no i cannot say that i have
 

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Re: Why do snail shells follow a Fibonacci sequence?
« Reply #3 on: 15/12/2009 03:22:44 »

 

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