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Questions about Biology's term

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Questions about Biology's term

Postby dorevidadamn » Sat Jun 13, 2009 3:34 am

Can someone tell me the meaning of some biology's terms?
The terms are as follow:
Chromosome
Homologous Chromosome
Chromatin
Chromatid
Bivalent
Tetrad


But not least tell me the differentiate between them.
I hope you can label all of them in picture so that I can understand well.

Thanks Very Much!!! :mrgreen:
DAMN!!!
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Postby alextemplet » Sat Jun 13, 2009 4:43 am

Does your textbook have a glossary in the back?
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Re:

Postby MichaelXY » Sat Jun 13, 2009 9:35 am

alextemplet wrote:Does your textbook have a glossary in the back?


If not, Google will. These lazy kids these days. Geez.
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Postby dorevidadamn » Wed Jun 17, 2009 11:44 am

I read already. But I can't understand about it. It make me confuse. :cry:
I checked for image at google but the image are same and didn't label the part. :?
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Postby alextemplet » Wed Jun 17, 2009 11:26 pm

Maybe I can answer your question better if you explain what parts are confusing you?
Generally speaking, the more people talk about "being saved," the further away they actually are from true salvation.

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Postby dorevidadamn » Sun Jun 21, 2009 2:53 am

What is the difference between chromatid, chromatin and chromosome?
It also state that bivalent is visible under microscope as a 4 part structure called tetrad. Is this means that bivalent is also tetrad?
My text book state that homologous chromosome consist of 2 chromosome(1 paternal, 1 maternal).
A tetrad consists of 2 homologous chromosomes, each made up of 2 sister chromatid.
Is that means tetrad consists of 4 chromatid and each of the homologous chromosome consists of 2 non-sister chromatid?

Thanks for your help. I really appreciate it.
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Postby Jesse2504 » Tue Jun 23, 2009 6:25 am

Chromosome: Is a structure composed of DNA which carries genetic information.

Homologous Chromosome: Chromosomes in a diploid organism which contain the same sequence of genes but are derived from different parents, and which pair with each other at meiosis

Chromatin: The complex of DNA and histone proteins that make up the basic material of eukaryotic chromosomes. This can also be used to describe the chromosomal material as a whole inclusive of other proteins.

Chromatid: Is a copy of a chromosome present after DNA and chromosome replication. So during metaphase the two halves of a copied chromosome are both chromatids. At anaphase these separate and become two new chromosomes.

Bivalent: A chromosome that has duplicated to form two sister chromatids still held together at the centromere.

Tetrads: Group of four chromatids at meiosis, or a pair of homologous chromosomes separating at mitosis to form a quadrangular shape.

Hope that helps, It is a little confusing like most scientific naming systems.
Jesse

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