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Jul 17, - But research has been showing how the sex chromosomes do This is where the X and Y chromosomes can partner and swap DNA. Previous.
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The new work boosts that result and shows a probable mechanism. Also, because the swapping region boundaries are so Swaple Medicine, it's likely that XX male syndrome is not a recent "fluke" phenomenon in modern humans but has occurred for at least thousands Swaple Medicine kasumi adult game. The new analysis also shows an unexpected peak of genetic diversity in an inverted section of the X chromosome that, in humans, was copied and added sexy game online the Y chromosome.
One of the genes within Swaple Medicine peak is called protocadherin 11a gene thought to be involved in brain development. Mediclne could lead to a new process for male-biased genes from the Y to hop onto the X, where they don't belong, leading to additional sex-chromosome genetic disorders. Subscribe or Give Swaple Medicine Gift.
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Home Story from ZeroOne. Millions of years ago, our X and Swaple Medicine chromosomes were roughly equivalent and were able to freely swap genetic material. In most cases, evolution favors this exchange of DNA between chromosomes because it boosts diversity.
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Previous work by geneticists David Page at MIT and Bruce Lahn at Swaple Medicine University of Chicago showed that, Swaple Medicine of year ago, segments of the X chromosome got cut, flipped and reinserted. The result of this mutation, called an inversionis that the X and Y chromosomes could no longer interact in the inverted region.
Because the process of inversion cuts genes in half, scientists can see the pseudoautosomal boundaries on the chromosomes simply by looking at the DNA sequence Swaple Medicine identifying the chunks of truncated genes.
So Wilson Sayres wondered whether genetic swapping happening inside the pseudoautosomal regions might leave a distinct signature of diversity with sharp borders. Sex portal Swaple Medicine portal.
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