Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
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Duplicated Homologs (<strong>and</strong> Sex Chromosomes)<br />
Pair During Early Prophase I<br />
• Special mechanisms mediate these<br />
intimate interactions between homologs<br />
• Prolonged meiotic prophase (prophase I)<br />
• sister chromatids tightly glued together<br />
called pairing<br />
• forming a four-chromatid structure called<br />
a bivalent<br />
• breaks in chromatid double-str<strong>and</strong> DNA<br />
• a fragment of a maternal chromatid is<br />
exchanged for a corresponding fragment<br />
of a homologous paternal chromatid
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