Peter Attia· MD
in other words to a first-order approximation the mitochondria lost all of its genes but deeper dig says actually it's somehow hung on to thirteen why do you think that was this is what we call reductive evolution modern-day mitochondria actually represent a mosaic so you need about a thousand proteins total to make our mitochondria and so some of those are attributable to the original bacterial ancestor and others are brand new innovations that even that original bacteria did not have but on the reductive side approximately a thousand genes from that original bacteria have either been lost altogether or have been transferred to the nuclear genome