If an autosome is present in only one copy at conception, that individual will not develop to term. Yet human males have only one copy of the X chromosome and they do develop normally. Why is there a difference?
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Although normal diploid cells have two copies of each autosome, autosomal number ... of two X chromosomes in females but only one in males raised several questions. ... 1. In embryos, it is first observed around the sixteenth day of development. ... of the presence of an extra X chromosome, whereas normal males do not.
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