An extra female sex chromosome might actually make guysmoremasculine

Between 1 in 500 and 1 in 1000 men have an special tenner chromosome , a experimental condition known as Klinefelter ’s Syndrome . In mouse , these superfluous distaff factor have an unexpected outcome , as the 2nd X chromosome really makes shiner more masculine .

When investigator talk about “ masculine ” and “ feminine ” demeanour , they ’re typically talking about an beast ’s sexual behavior . And what specific behaviors might those be , pray tell ? For the answer , have ’s go to the novel newspaper by University of Virginia researchers to see just what happens when manful mice get a second distaff sexuality chromosome :

Counter intuitively , male with two Adam - chromosomes were fast to ejaculate and exhibit more ejaculations than males with a single X. Moreover , black eye of both sexes with two cristal - chromosomes exhibit increased frequency of mounts and thrusts .

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As New Scientist describe , two types of mouse were used in the study . One were those with the uncommon but normal XXY chromosomal mutation . The others actually had their Y chromosome shifted to a non - sex chromosome , effectively attain them male mice with XX sexual chromosome . In both case , the mice had the same testosterone stage as your average XY computer mouse , but both displayed these more masculine sexual behaviors . This suggests that intimate demeanor are see by more than just the presence of the hormones testosterone and estrogen .

Since the researchers found the same upshot in both the XX and XXY mice , we can finger pretty confident that the result is independent of the Y chromosome . or else , whatever is making those mice act more sharply masculine can be traced to their female sexual practice chromosome . It ’s an open question whether this effect also contain lawful in humans , but it might well explain why a recent sketch find that males with Klinefelter ’s Syndrome tended to have more sex than other guys .

While that second X chromosome is mean to be inactive in both females and any male who chance to have it , this research supports the line of reasoning that this is n’t the face – up to 25 % of this purportedly latent chromosome ’s cistron might actually be express . The researcher suspect that the saying of an as yet undiscovered gene is creditworthy for altering the sexual behavior of these black eye , and how this chromosome regard the manifestation of cistron elsewhere might help excuse broader behavioral differences between the sex .

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