Sexual reproduction in animals
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Sexual Reproduction in Animals. Fertilization. Sperm nucleus enters the egg and moves to the egg nucleus. The 2 nuclei join together and then form a zygote . External Fertilization *outside the body. Animals that breed in the water Many hazards in the environment Sperm and egg may not meet

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Fertilization

  • Sperm nucleus enters the egg and moves to the egg nucleus. The 2 nuclei join together and then form a zygote.


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External Fertilization*outside the body

  • Animals that breed in the water

  • Many hazards in the environment

    • Sperm and egg may not meet

    • Eggs or offspring may be eaten

    • May die due to environmental conditions

      • Temperature

      • Oxygen level


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Internal Fertilization hazards*within the female body

  • Land animals

  • Some aquatic animals

    • Shark

    • Octopus


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Zygote

Turtle laying eggs


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  • Internal Fertilization shell and released OR remains and develops in female body

    • Fewer eggs needed

    • Well protected

    • Increased chance of fertilization

      Parthenogenesis – development of unfertilized egg into an adult.- Bees & Wasps


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