Relationship between diploid stages and complexity...

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masteroc
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Relationship between diploid stages and complexity...

Post by masteroc » Thu Feb 01, 2007 12:58 am

Hey,

Can you guys help me figure out this question:

"What is the relationship between a diploid cell stage and the relative complexity of the organism."

Thanks!

Bio_Jenn
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Post by Bio_Jenn » Thu Feb 01, 2007 7:38 am

Is this question referring to humans only?

In general, organisms are more complex in their diploid cell stage than they are in their haploid cell stage. The only haploid stage humans go through is before fertilization as gametes. Diploid humans are much more complex than our haploid gametes.

Another example would be the alternation of generations life cycle of some plants. A diploid adult plant will release haploid spores. These spores will grow into smaller, less complex adult haploid organism. After fertilization with another haploid plant, a much more complex diploid organism will grow.

I hope that helps.

masteroc
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Post by masteroc » Thu Feb 01, 2007 11:00 pm

thanks for the fast response!

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MrMistery
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Post by MrMistery » Fri Feb 02, 2007 6:07 pm

yeah, but there are some algae where the diploid stage is just the zygote, and the organism itself is haploid. Plus bryophytes are more complex in their haploid stage..
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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Post by Bio_Jenn » Wed Feb 07, 2007 4:34 am

That is very true. There are exceptions to this rule. A few protists and all fungi are more "complex" in their haploid stages because they are only diploid as a zygote.

In plants and animals, however, the diploid stages are more complex. The answer really depends on what organisms you are studying.

Thanks for the reply MrMistery.

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