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<p>develop <a href="page.php?w=XYY_syndrome">Jacob's Syndrome</a>, as genes on the Y chromosome generally trigger the development of a male phenotype. Other chromosomal variations include three X chromosomes (or <a href="page.php?w=Trisomy_X">Trisomy X</a>), and <a href="page.php?w=Turner_syndrome">Monosomy X</a> (or <a href="page.php?w=Turner_syndrome">Turner Syndrome</a>), where individuals only have one X chromosome and no Y chromosome. Some individuals with an XY karyotype, develop phenotypically female due to mutation in genes such as the <a href="page.php?w=Sex-determining_region_Y_protein">SRY</a></p><p>
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