National Center for Biotechnology information

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National Center for Biotechnology information

• Chromosome X

• Chromosome Y

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External Development

• Initially undifferentiated, the presence of
  hormones causes sexual differentiation

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Internal Development

• Initially undifferentiated, the presence of
  hormones causes sexual differentiation

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Karyotype

• karyotype    n.
• The characterization of the chromosomal
  complement of an individual or a species,
  including number, form, and size of the
  chromosomes.
• A photomicrograph of chromosomes arranged
  according to a standard classification.

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Karyotype of a Human Child Boy
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Karyotype of a Human Child Girl