▁segments ▁of ▁the ▁mit och ond rial ▁gen ome , ▁including ▁the ▁D - loop ▁and , ▁in ▁some ▁extreme ▁cases , ▁a ▁number ▁of , ▁nearly , ▁the ▁full - length ▁mit och ond rial ▁gen ome . ▁ ▁The ▁sequence , ▁frequency , ▁size ▁distribution , ▁and ▁even ▁the ▁difficulties ▁of ▁finding ▁these ▁sequences ▁in ▁the ▁gen ome ▁vary ▁substantial ly ▁among ▁species . ▁The ▁majority ▁of ▁DNA ▁fragments ▁transferred ▁from ▁mit och ond ria ▁and ▁pl ast ids ▁into ▁the ▁nuclear ▁gen ome ▁are ▁less ▁than ▁ 1 ▁k b ▁in ▁size . ▁Yet , ▁extremely ▁large ▁fragments ▁of ▁organ elle ▁DNA ▁are ▁found ▁in ▁some ▁the ▁plant ▁genom es . ▁ ▁As ▁the ▁gen ome ▁evol ves ▁and ▁al ters ▁over ▁time ▁by ▁mut ation , ▁the ▁number ▁of ▁NUM T ▁in ▁the ▁gen ome ▁diff ers ▁over ▁the ▁course ▁of ▁evolution . ▁NUM T ▁enters ▁the ▁nucle us ▁and ▁inser ts ▁in ▁the ▁n D NA ▁at ▁different ▁stages ▁of ▁the ▁time . ▁Due ▁to ▁constant ▁mut ation ▁and ▁inst ability ▁of ▁NUM T , ▁the ▁res embl ance ▁of ▁this ▁gen ome ▁stretch ▁to ▁the ▁m t D NA ▁var ies ▁widely ▁across ▁the ▁kingdom ▁Animal ia ▁and ▁even ▁within ▁the ▁certain ▁gen ome . ▁For ▁instance , ▁the ▁latest ▁number ▁of ▁NUM T ▁recorded ▁in ▁the ▁human ▁gen ome ▁is ▁ 7 5 5 ▁fragments ▁which ▁range ▁from ▁ 3 9 ▁b p ▁to ▁almost ▁the ▁entire ▁mit och ond rial ▁sequence ▁in ▁size . ▁There