Help! The evolution of genes and their actions? (1 Viewer)

soiled_poncho

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Can someone help me with this dot point? I can't find anything good.

Discuss the evidence available from current research about the evolution of genes and their actions:


Thanks so much.
 

silvermoon

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isn't this about homeotic genes?
HOMEOTIC GENES --> have similiar functions and similiar structures and are expressed in the same order in which they are found. Insects have involved additional genes which repress limb development, suggesting they evolved from organisms with many legs. The genes at the top of the cascade that produces eyes in mice and insects is so similiar that they can be interchanged and still function correctly.
hope that helped! *gets back to furious study*
 

Tommy_Lamp

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Its regarding Homeobox (HOX) genes, from my notes:
Research that has been done regarding the evolution genes, has led to the
theory that HOX genes are descendants of an ancestral gene that first contained
a homeobox cluster and had related functioning.
 

silvermoon

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hmm, just to add to what i said above:
Homeotic genes have been found in most groups of multicellular organisms including invertebrates, vertebrates, yeasts and plants. The presence of these similiar DNA sequences in organisms as different as yeasts and humans suggests a common ancestry of all eucaryotic organisms - biologists expect to eventually discover homeotic genes in all eucaryotic organisms.
 

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