Definition: In phylogenetics, a subpetiolar gene is a gene that is located in a region of a genome that lies within or close to another gene. This means that it is part of a larger gene family and can be inherited from one parent to another through sexual reproduction. For example, the subpetiolar gene may be found in the mitochondrial DNA (mtDNA) of an ancestor of a species, which then passes on this genetic material to its descendants. Similarly, a subpet
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