Study on chromosome number and shape of living organisms, such as ones made by leading a cell body, such as certain types of white blood cells is studied and taken photos of the chromosome, and then take a photo from chromosome arrangement according to the shape, style, and size. In people with chromosome pair 23 46 organized bar divided into all of the same style, which is soaking wet in male and female of the pair's 23 section 22 chromosome pairs of the gender differences in characteristics such as
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