What is the possible significance of the finding that genes related to bacteria and archaea occur in the eukaryotic genome?
A) The ancestor of the modern eukaryotic cell may have been a primitive, mitochondria-free cell with a nucleus.
B) An archaeon may have engulfed a bacterium to form a eukaryotic cell.
C) The presence of genes related to bacteria and archaea is a byproduct of meiosis.
D) These genes may be the result of horizontal gene transfer.
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