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Sex reassignment surgery in the male transsexual

S S Ratnam1, A Ilancheran

  • 1Department of Obstetrics and Gynaecology, National University Hospital, Singapore.

British Journal of Hospital Medicine
|September 1, 1987
PubMed

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The Y Chromosome Determines Maleness02:19

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...