Sperm Meets Egg

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Sperm Meets Egg

• External fertilisation

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External fertilisation
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External fertilisation
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External fertilization
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External fertilisation

• Many fish swim side by side when releasing their
  eggs into the water.
• If a sperm meets an egg, fertilisation takes
  place.
• If they dont meet, sperm and egg die.

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External fertilisation
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External fertilisation
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External fertilisation

• The male frog sits on the females back.
• He releases his sperm into the water as she lays
  her eggs

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External fertilisation
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External fertilisation
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External fertilisation

• The stickleback fish build a nest which the
  female lays her eggs in.
• The male then swims through the nest releasing
  his sperm onto the eggs