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Question: Introns are found in eukaryotes and some archaea but not generally in bacteria. There are two tho…

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Question: Introns are found in eukaryotes and some archaea but not generally in bacteria. There are two tho...

Introns are found in eukaryotes and some archaea but not generally in bacteria. There are two thoughts as to the source of introns. The “intron early” model says that introns have always been an integral part of genes and those organisms without introns have lost them in the course of evolution. The “intron late” model supposes that the ancestral protein-coding units consisted of uninterrupted sequences and that introns were subsequently inserted into them. Discuss the evidences that support the “intron early” and “intron late” models of intron development. Include thoughts on the evolutionary forces that may be involved to eliminate introns in bacteria (intron early) or insert introns in non-bacterial species (intron late). You may want to look at the mechanisms and difficulty of precisely removing an intron vs inserting an intron. The evolutionary tree below represents the current thought on the relative distance and grouping of various organisms and organelles.

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