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Most likely A came first. And then mutations in the original A gene caused B and O to appear.
One way scientists figured this out was by using something called coalescence analysis. Basically, this is where you compare DNAs and figure out when they used to be the same.
From this kind of analysis scientists concluded that A came first. Then, about 3.5 million years ago, the A gene mutated in someone and blood type B was born. The same thing happened about a million years ago for O blood type. So O is actually the most recent blood type.
At first this might seem weird since O is the most common blood type, but these kinds of things happen all the time. Different traits can become more common over time for lots of different reasons.
For example, if a trait gives some sort of advantage, it can quickly become the norm. How quickly this happens depends on how big an advantage the trait gives.
So what's the use of having O blood? One theory is that it makes people suffer less severe symptoms from malaria.
As I said earlier, humans probably started with mostly A type blood. In areas with lots of malaria, these A folks lived shorter lives and had fewer babies than the O ones. Over time, the O folks slowly came to dominate.
This is one way that O might have become the most common human blood type. And there are many others possible ways, some of which don't even require an advantage.
What I'll do for the rest of the answer is talk a bit about how genes get changes in them to create new traits. In other words, for our discussion here, how did O and B spring from A? I'll also talk a bit about why having an O blood type can make you suffer less from malaria.
Blood type B and O came from A
If humans started out as A blood type, where did O and B come from? They came from small changes in the A gene.
To understand how this happened, we need to step back a bit and discuss genes and DNA. Because A, B, and O are all the result of one of our genes.
Each of our thousands of genes has the instructions for one small part of us. The gene we're interested in is called ABO. This gene comes in three different versions -- A, B, and O. The four common blood types all come from different combinations of these versions (or alleles as scientists like to call them).
The instructions in genes are written in DNA. The alphabet of this language has just four letters -- A, G, C, and T. The ABO gene has around 20,000 of these letters all arranged in a certain order.
The differences between the three different ABO alleles are actually very small. There is only a single difference between O and A and just four between A and B.
These kinds of differences originally came from things like environmental damage or mistakes our own cells made copying DNA. DNA changes like these are surprisingly common.
Given that many of these mutations are not good for us, we're lucky that our cells are nearly perfect at fixing them. But our cells don't catch all mutations--some are missed.
Sometimes one of these missed mistakes can cause problems like cancer or cystic fibrosis. But sometimes they can be helpful too. Like when they change A to O and this happens to give some protection against malaria.
So how does a single letter change protect someone from malaria? It does this by affecting the protein that gets made.
In order for a gene to perform its function, its instructions must be read and a protein made. It is the protein that goes off and does the work.
To get from DNA to protein, a cell needs to read a gene's instructions. Remember when I said that the genetic language has only four letters? Well, it also only has 64 three-letter words. This is called the genetic code.
Each combination of 3 letters makes up an amino acid and proteins are made up of these amino acids. So, a gene is really just a long string of three letter words that tells a cell to connect amino acids in a certain order.
Now imagine what would happen if you were to change (mutate) one of the letters that codes for an amino acid. Let's take as an example the amino acid leucine.
originally posted by: douglas5
a reply to: TheoFieldsGardener
S & F op
Do you taste, smell and hear things others do not? Can you easily sense when people lie to you? Are you a loving but easily moved to jealousy? Are you especially gifted at pleasing your lover? Do you rarely say you’re sorry for anything and hold a grudge? Do you lose fights or altercations? Do you have a green thumb? Do bad things happen to those who oppose you without lifting a hand?
all the above especially the last one always wondered about that
The O types I know of are the least spiritual of those I know and also selfish and sort of deluded in that they aren't aware that people see their selfish motives. They also aren't holders of any karmic powers, in fact the opposite. But they are part of masonic type groups that are misogynist, spiteful and greedy, also deluded as their core motives are based on lies and used for making scapegoats from innocents and punishing them for refusing them their lies and taking blame.
When the bible was written by men, they knew nothing of the science of blood types nor categorized people because of blood types. They had no way of differentiating any types of blood nor any knowledge of it.
originally posted by: TheoFieldsGardener
a reply to: Stormdancer777
Their story is in the Kebra Nagast. Children of Zadokites and Solomon's son with Sheba. His name was after his grandfather David (not the real name).
Believe that if you want, but its O- that saves peoples lives as its compatible with everyone yet only 7% of people in the U.S. have it. think about that.
A is the oldest..please. O- were the first, we have the power to save you all or let you perish. lol
Ok first off its not Nike Laitans. The word is NicoLaitans and Nico=ruler or to dominate. It is ruling of the laity or creating castes of Laity and Holy.
Firstly your information is wrong. The truth is that type A was first.
I'm o- and I can read minds. I can sort of sense what some people are thinking can't really hear their thoughts. Also I haven't learned to control it yet and most of the time I can only sense bad thoughts. Btw I'm a strong believer in The Almighty.
do some research on the yazidi and their relationship to the zadok priesthood, the zadok actually were wandering rain makers,
I have some odd abilities. I am definitely different. My friends sometimes joke that I am an alien.
I usually excel at things far faster and easily than my friends or co-workers.
Texta reply to: PLAYERONE01
Firstly your information is wrong. The truth is that type A was first.
Secondly, your attitude is offensive and revealing as to your character. You see people as superior /inferior depending on blood types and your delusions about them.
I think you are misled and far from spiritually connected to the infinite creator energy.