Quote:
Originally Posted by Drolefille
I'm aware of AO/BO genotypes - and how the crossing works, but what confuses me is the idea that OO is on the increase when a cross with any non-OO reduces the chances of passing the OO on from 100% to at most 50% and down to as low as 0% if the partner is AA/AB/BB. It seems as if there is an equilibrium of sorts, but not necessarily an increase?
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If there are more O people (which is a fact), and they are having kids with people who are AO BO or OO, their offspring are more likely to be O and not A or B. Since AB is the smallest group and there are AA and BB people, it isn't as if A B and AB will disappear, but they will decrease as the O people breed and their O kids breed and on and on. I'm not saying it will be significant in our lifetime, this is a long term process.
O is already the majority blood type, statistically it is more likely for someone to be O and mate with someone who is O. Even though it is recessive the more people out there who are O will increase the amount of people who are O, over time. Factor in the people who are AO and BO and there is potential for a lot more O blood type.
I'm speaking in averaged terms, it varies within groups, but being conservative O is at 40% and it going to keep rising when you look at the birth rates of particular groups and if O is more common.
http://www.ncbi.nlm.nih.gov/bookshel...rt=ch2#ch2.1.4