X-inactivation is a process by which one of the two copies of the X chromosome present in female mammals is inactivated. The inactive X chromosome is silenced by its being packaged in such a way that it has a transcriptionally inactive structure called heterochromatin. As nearly all female mammals have two X chromosomes, X-inactivation prevents them from having twice as many X chromosome gene products as males, who only possess a single copy of the X chromosome. The choice of which X chromosome will be inactivated is random in placental mammals such as humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism. Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
The numerical value of x-inactivation in Chaldean Numerology is: 8
The numerical value of x-inactivation in Pythagorean Numerology is: 8
Sample Sentences & Example Usage
The failure of inactivation was evident because growth was being detected on multiple production runs, these runs were routinely sent back for additional radiation. It should have been seen for what it was: an indication that the margin of safety with the method was not sufficient.
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"x-inactivation." Definitions.net. STANDS4 LLC, 2017. Web. 30 Mar. 2017. <http://www.definitions.net/definition/x-inactivation>.