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Please help me put these terms into the correct category

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Please help me put these terms into the correct category

Postby MissDee » Wed Nov 24, 2010 2:42 pm

- DNA Replication
- Crossing Over
- Metaphase II --> Anaphase II
- Fertilization

Each of these go into three different categorizes:
1.) Heredity only
2.) Genetic variation only
3.) Both
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Postby JackBean » Mon Dec 06, 2010 9:37 am

3
3
3
1
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Re:

Postby magicsiew » Tue Dec 07, 2010 9:05 am

JackBean wrote:3
3
3
1



DNA replication heredity only under normal condition (ignore mutation)?

Fertilization combine genetic material from mother and father, so is it both? Heredity and variation.
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Postby JackBean » Tue Dec 07, 2010 9:10 am

but fertilization does influence the variation, that's influenced by the segragation during gametogenesis
http://www.biolib.cz/en/main/

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Re:

Postby magicsiew » Tue Dec 07, 2010 12:38 pm

JackBean wrote:but fertilization does influence the variation, that's influenced by the segragation during gametogenesis


So the arrangement is
1
3
3
3

Right?
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Re:

Postby JackBean » Tue Dec 07, 2010 12:47 pm

Sorry, I miswrote that, it should be
JackBean wrote:but fertilization does NOT influence the variation, that's influenced by the segragation during gametogenesis



Are you sure, that mutations should be omitted?
http://www.biolib.cz/en/main/

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Postby magicsiew » Tue Dec 07, 2010 2:25 pm

My opinion is mutation will occur, but we got mutation repair system as well, majority of the mutation will be repair, otherwise many people will have genetic disorder or become mutant. One of the purpose of DNA replication is to replace old cell, so the newly replicated DNA should not has variation.

About fertilization, what come up in my mind is the fetus formed is combination of male and female genetic material, but the fetus may not show exactly the same as their parents. Taking example of calico cat in dosage compensation. The calico cat can has both parents that is not calico cat and the mechanism that control this occurred after the fusion of gametes.
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Postby JackBean » Tue Dec 07, 2010 4:35 pm

OK? but the process of fertilization by itself does not introduce any variation at all.

If there were no mutations during replication, you would have no change at all.
http://www.biolib.cz/en/main/

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