![]() ![]() 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. 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. "That would be an amazing feat.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. "And if we can get the genome sequences of one representative from each primate lineage, we could reconstitute the ancestral primate genome-what the genome of our common ancestor some 40 to 50 million years ago looked like," he told LiveScience. The rhesus monkey genome sequence should prove invaluable to biomedical research, said physician scientist Ajit Varki at the University of California at San Diego, who participated in the chimpanzee genome sequencing project. As to why this happened, "no one knows," said researcher Mariano Rocchi at the University of Bari in Italy. Strangely, nine of the 22 centromeres the monkeys have repositioned themselves on their chromosomes in the last 25 million years. This is consistent with the same mysterious rearrangements seen in the human lineage's X chromosome following the branching off of the chimpanzee, and gives "us new evidence of the unusual role of this sex chromosome in primate evolution," said researcher Aleks Milosavljevic at the Baylor College of Medicine.Īnother as yet unexplained phenomenon the sequencing revealed has to do with lumps of DNA known as centromeres, which hold together the two separate strands of DNA that make up a chromosome, acting somewhat like the center of an X. For instance, the monkey's X chromosome showed an unexpectedly large number of times in which its parts got shuffled around. The research also raised a few surprises. These include genes involved in hair formation, sperm-egg fusion, immune response and cell membrane proteins, findings detailed in the April 13 issue of the journal Science. In addition, the researchers identified roughly 200 genes that appear to be key players "in defining the shapes of species, in what makes the primates different from us and each other," Gibbs said. (Rhesus monkey ancestors diverged from those of humans roughly 25 million years ago, while chimpanzees diverged from our lineage 6 million years ago.) The fact that rhesus monkeys are further away from humans in evolution will help illuminate what makes humans different from other apes in ways that chimps, which are so closely related to us, could not, Gibbs said. By comparison, humans and chimpanzees share about 98 to 99 percent of their DNA. The new analysis of the rhesus monkey genome, conducted by an international consortium of more than 170 scientists, also reveals that humans and the macaques share about 93 percent of their DNA. Macaques have about the range of diversity when it comes to their genetics, "so being able to understand them on a genetic level will help explain variation in their responses and will allow for smarter experiments that make us more clever at deciphering results." ![]() "Right now if you perform an experiment on a person, there's no way that you would think that all people are the same, when it comes to a response to a drug or behavior or anything," Gibbs told LiveScience. The sequence of the rhesus macaque's genome will be a powerful tool for research with the monkeys aimed at understanding human biology, said consortium leader Richard Gibbs, director of the Baylor College of Medicine's Human Genome Sequencing Center in Houston. ![]()
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