Then, with a single DNA change, blue, green, hazel, and all of the rest of the other eye colors became possible. In the beginning, almost all people had brown eyes. These genetic variations (as established mutations are called) help us to evolve and stay strong as a species.Įye color is a great example of how DNA mutations can cause genetic variation. They can have positive and negative effects on the body and are important to the evolution of life. Or terrible diseases like cystic fibrosis or cancer.īut not all mutations are bad. When you think of a mutation you probably think of giant spiders attacking San Francisco. Believe it or not, this is where all the wonderful variation we see around us came from. If these kinds of changes happen in an egg or a sperm, then they can be passed down to the next generation. The cell can usually fix these but sometimes it does not do its job perfectly and the mistake stays. Outside things like UV light from the sun can also cause mutations by damaging the DNA. Rh negative is just an ordinary DNA difference that happened the way these kinds of things usually do. Occasionally a mistake slips through and the new cell has a DNA change. Each time a cell divides, it needs to copy its DNA. And they happen all the time.įor example, mutations can happen when cells divide to make new cells. The differences we see in each person's DNA are ultimately due to mutations.Ī mutation is simply a change in the DNA. DNA Can and Does ChangeĪs I hinted at before, each of us has a different set of DNA that makes us unique in our own special way. In the end you'll see that being Rh negative is just an ordinary DNA difference that happened the way these kinds of things usually do. In some situations, the good of parasite resistance trumps the bad of the pregnancy problems.įor the rest of this answer I am going to focus on how DNA differences come about and how they can spread throughout the population.
Some researchers think that it may make people more resistant to certain parasites like Toxoplasma.
This difference has probably stuck around because it has some good points too. Mom just has an ordinary DNA difference that can have bad effects on her pregnancy. As if the mother and child are from different species.īut they're not. HDN makes it look like the mother is rejecting the child. This is called hemolytic disease of the newborn or HDN. This can cause the baby to get very sick or even die. When an Rh negative mother is pregnant with an Rh positive child, the mother's immune system can attack the baby's blood. But some people think it must be special because of the effects it can sometimes have on pregnancy. So being Rh negative isn't any stranger than having blue eyes or red hair. No, being Rh negative did not come from aliens or gods. There is no need to invoke aliens, gods or reptiles. And when we look at Rh negative and Rh positive people, we see the usual kind of difference.
We have different traits because of small differences in our DNA. There is DNA that controls our hair and eye color, our blood type and most everything else about us.
O NEGATIVE BLOOD PERCENTAGE MANUAL
Remember, DNA is the instruction manual that makes us who we are. So, where do these sorts of differences come from? They come from our DNA! In this way, it isn't any stranger than different eye or hair colors. In fact, Rh negative blood is an ordinary trait that some people have and some people don't. However, there is no evidence to support this. What an interesting question about Rh negative blood! It would be very cool to think that our human ancestors bred with reptiles and/or gods.
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