male pattern baldness is polygenetic,,can come from either and/or both.
other animals and primates experience balding as well when their androgen levels rise during "animal puberty" and adulthood...i think the stump tail macaque (some sort of monkey/primate) does go bald when androgens are prescent,,with the same hairline recession as humans,, during early pharma phase testing of finasteride/propecia and proscar these animals were used, i belive the dogs beagles were used to test the effects of these drugs on the prostate(along with the allmighty rats),,because this species of dogs is prone to BPH when they get older as well...what is interesting and not well understood is the speed of progression of MPB...i know some people who are almost completely bald by age 22,,,yet others that takes until they are in their 70's. everyone male or female will loose hair over their lifetime regardless of MPB due to normal aging.
i think the rate of androgen deactivation and clearance plays a huge role in the speed of progression of MPB. 3BHSD(hydroxysteroid dehydrogenase) and 17BHSD plays the main role of the conversion of testosterone and DHT into androstenedione/diol and the 5alpha diols/dione;s,,,,,these diones and diols(metabolites)when congugated with glucoronidase are the main product that are cleared from our body via kidneys...if we can invent a product that will increase the rate of reduction of testosterone and dht to dione and diol metabolites and clearance of these metabilites qickly from the body before they convert back into test and dht (the reaction goes both ways with testosterone and androstenediol,,,body tries to keep and equilibrium)...also probably keeping your kidneys healthy by not developing diabetes or getting high blood pressure will help as well with clearance,,i am just babling on sorry......i still believe DHT is not our enemy though,,a potent androgen is in our body for a reason,,,millions of years of evolution cant be wrong,,although looking at me i am the missing link.