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Sexual Reproduction in Animals

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

danieljordan
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Sexual Reproduction in Animals

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  1. Sexual Reproduction in Animals

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

  3. 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

  4. External Fertilization • Large number of sperm and egg are released to overcome hazards • Hormones control behavior to have sperm and egg released at the same time.

  5. Internal Fertilization*within the female body • Land animals • Some aquatic animals • Shark • Octopus

  6. Internal Fertilization • Requires specialized sex organ to carry sperm to body of female • Watery environment needed for sperm to swim to the egg

  7. Internal Fertilization • After fertilization, zygote is enclosed in a protective shell and released OR remains and develops in female body Zygote Turtle laying eggs

  8. Internal Fertilization • Fewer eggs needed • Well protected • Increased chance of fertilization Parthenogenesis – development of unfertilized egg into an adult.- Bees & Wasps

  9. Mr. Lee’s Rap • http://www.youtube.com/watch?v=_IOIx__UJ5g&feature=related

  10. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com Is home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching

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