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Metazoan gene count


The story talks about humans.  However, if one reads between the lines,
it appears that this "phenomenon" applies to nearly all(?) metazoans.

Curious, isn't it, that evolution stopped adding genes to metazoan
chromosomes when the magic number of 25,000 genes was reached.  Past that
point, evolution only played with the genes already present in the
chromosome.  Who would have guessed that evolution could count?

What I would like to know is, what is the phylogenetic topology of "junk"
DNA in metazoans?  Do humans have more "junk" DNA than, say, earthworms?


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