Magic Knights Rayearth

Magic Knights Rayearth

Sunday, April 27, 2008

Chromosomes

For my students =)

Those of you who still have problems on understanding What is a CHROMOSOME, this post is for you. Do read and try to understand. Enjoy!

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-A chromosome is found in the nucleus of all cells (except RBC, since they do not have nucleus)

-Chromosomes are made up of a long, linear DNA molecule which in turn is made up of many sets of genes : it is the genetic material that all organisms inherit from their parents

-A DNA molecule is usually very long & consists of hundreds & thousands of genes

-G1 phase : cell does its normal everyday job. Each chromosome contains only a single molecule of DNA where it is not condensed & appear like thread-like structures called chromatin

-S phase : synthesis of DNA occurs. Replication of DNA in nucleus. Duplication will result in sister chromatids

-Within a sister chromatid, it contains a DNA double helix

-G2 phase : cell gets ready for mitosis

-When cell division begins, chromatins will condense, coil up, compact & thicken, thus making them easily seen under the light microscope. In the middle, it has a narrow region called the centromere

-DUring mitosis, this 2 sister chromatids will finally separate during anaphase & each will become an independent daughter chromosome

5 comments:

Anonymous said...

lol cool blog teacher. X)

Anonymous said...

Agree with nic.
Nice blog teacher. :D
you should have a chat box. :D lols.
Try cbox or shoutmix? :)

Addicted to weird said...

Teacher, you're dear 5 Jati student here. What on earth are you posting about? You should be reviewing bout your shopping trips. =P

Anonymous said...

zomg.

pn chew.
didn't know u had a blog! :)

Shariel said...

Thanks you guys....^_^ DO visit often. Sorry for not updating more often. Haha.

Nic : Thx for d comment. ^_^

Ruic : Will think bout the chatbox.
Thx for the input. =)

Marianne : Review my shopping sprees?
No la, you guys will think
I'm some but on the loose.

Zhiling : Y? Teachers cannot be
cool creatures to have
blogs? =p Hehe. Send me
your URL link if you have
one too. Will add you on
mine.