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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PowerPoint Slideshow about 'Sexual Reproduction in Animals' - Audrey


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Presentation Transcript
fertilization
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
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
slide5
Large number of sperm and egg are released to overcome hazards
  • Hormones control behavior to have sperm and egg released at the same time.
internal fertilization within the female body
Internal Fertilization*within the female body
  • Land animals
  • Some aquatic animals
    • Shark
    • Octopus
slide7
Requires specialized sex organ to carry sperm to body of female
  • Watery environment needed for sperm to swim to the egg
slide8
After fertilization, zygote is enclosed in a protective shell and released OR remains and develops in female body

Zygote

Turtle laying eggs

slide9
Internal Fertilization
    • Fewer eggs needed
    • Well protected
    • Increased chance of fertilization

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

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