Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
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• Yolk<br />
– rich in lipids, proteins, <strong>and</strong> polysaccharides <strong>and</strong> yolk granules.<br />
• Egg coat<br />
– Extracellular matrix consisting largely of glycoproteins<br />
– Vitelline layer in eggs of sea urchins or chickens<br />
– Zona pellucida in mammalian eggs<br />
– acts as a species-specific barrier to sperm
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