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Offline tejaswini

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cell division
« on: 10/02/2006 15:37:25 »
when the cells divide during binary they expand . why does this happen is there a chemical explanation behind this.[?]

tejaswini


 

Offline saam_gll

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Re: cell division
« Reply #1 on: 24/05/2006 18:32:38 »
hi got a very confused question
shown below is the part of the sequence of the molecle og DNA.
----------GAT CCG CAC-----------

DURING REPLICATION OF THE MOLECULE, PART OF THE SEQUENCE MIGHT BE COPIED INCORRECTLY

1) One type of mistake could be that the T is ommited. The code would then read GAC CGC AC
2) Another type of mistake could be that the T is replaced by a G.the code would then read as GAG CCG CAC.

A)WHAT IS THE GENERAL NAME TO DESCRIBE SUCH MISTAKES IN THE DNA?
B)WHAT IS THE SPECIFIC NAME GIVE TO DESCRIBE THE MISTAKES DESCRIBED IN 1 AND 2 ABOVE?
C)WHAT WOULD BE THE DIRECT RESULT OF THE CHANGES DESCRIBED IN 1 AND 2 ABOVE?


SAAM
« Last Edit: 24/05/2006 18:34:46 by saam_gll »
 

Offline Cut Chemist

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Re: cell division
« Reply #2 on: 24/05/2006 18:44:37 »
A)  I think they're called point mutationsB)  
Look up wobble rules for translation

http://en.wikipedia.org/wiki/Point_mutation
  Then each of these are probably either
-nonsense mutations: code for a stop, which can truncate the protein.
-missense mutations: code for a different amino acid.
-silent mutations: code for the same amino acid.

C)Obviously silent would have no change
and missense would have one different amino acid
 

Offline Vadermort

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Re: cell division
« Reply #3 on: 25/05/2006 04:57:37 »
DNA replication is e very fragile process. Small changes in base pairs can have large effects. what you are taking about (point mutations)
1. An extra base is added is known as (insertion)
2. A base is removed is known as (deletion)

An example would help explain this.
original DNA sequence - ATGTCGAAGCCC
This is translated to mRNA - UAC AGC UUC GGG
this codes for amino acids - tyr-ser-phe-gly

(insertion) if an organic base A is added right after the first T gives the sequence - ATAGTCGAAGCCC
The mRNA sequence will now be - UAU CAG CUU CGG
this codes for amino acids -    thy-glu-leu-arg

You can see how this affects a lot. Deletion is the opposite.


b.s
 

Offline DoctorBeaver

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Re: cell division
« Reply #4 on: 25/05/2006 06:47:06 »
How do these replies answer the original question which was about expansion not mutation?

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http://beaverlandforum.y4a.net
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Offline Vadermort

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Re: cell division
« Reply #5 on: 28/05/2006 07:02:07 »
i was just trying to teach and learn something here

b.s
 

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Re: cell division
« Reply #5 on: 28/05/2006 07:02:07 »

 

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