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<p>Beginning with determining sex by genetic and/or environmental factors, humans and other organisms proceed towards different differentiation pathways as they grow and develop.</p>

<p><big>Sex determination systems</big></p>
<p>Humans, many <a href="page.php?w=Mammal">mammals</a>, and some <a href="page.php?w=Insect">insects</a> and other animals have an <a href="page.php?w=XY_sex-determination_system">XY sex-determination system</a>. Humans have 46 <a href="page.php?w=Chromosome">chromosomes</a>, including two <a href="page.php?w=Sex_chromosome">sex chromosomes</a>,</p><p>
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