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If a person has a total gender reassignment - sex change no matter how extreme the operation goes with hormone injections etc; on a DNA level, the sex of that person is absolute? No amount of surgery, hormone injections or anything else will change someone's DNA from a man's to a woman's or vice versa. As you know, for humans, sex is determined by the presence of a Y chromosome -- humans with an X and a Y chromosome are male and those with two X chromosomes are female.

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They are separated in two local forms that share a common origin in hybridization between the other two forms West Japan and Kanto with male heterogametic sex determination and homomorphic sex chromosomes.

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This page has been archived and is no longer updated. By the s, scientists had established methods for staining chromosomes so that they could be easily visualized using a simple light microscope. With this staining method, scientists were able to observe cell division and to identify the steps that occurred during both mitosis and meiosis Figure 1.

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