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qetzal



Posts: 308
Joined: Feb. 2006

(Permalink) Posted: Dec. 13 2011,13:15   

Marty,

I still want to know what they consider "new genetic information." Which of these would qualify, in their opinion?

A) a mutation in an existing gene that has no effect on gene function
B) a mutation in an existing gene that modifies the existing function (eg maybe changes gene expression levels, or changes catalytic rates of an enzyme encoded by the gene)
C) a mutation in an existing gene that creates a new function (eg the encoded enzyme can now act on a different substrate, or the encoded protein can now bind to a different DNA sequence)
D) an existing gene that gets duplicated, with no change in the DNA sequence
E) a gene that gets duplicated with some sequence change that either modifies gene function (E1) or creates a new function (E2)
F) duplication of a large stretch of the genome, without or with modified or new functions
G) duplication of the entire genome (polyploidy)
H) introduction of DNA from an outside source, such as integration of viral DNA into the host's chromosome
I) appearance of brand new genes that didn't previously exist in that organism and weren't somehow introduced from an outside source.

  
  366 replies since Nov. 08 2011,06:46 < Next Oldest | Next Newest >  

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