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Sexual Reproduction in Animals

Learn about sexual reproduction in animals, including external and internal fertilization methods. Discover how zygotes are formed, the hazards animals face, and the strategies they employ to ensure successful reproduction.

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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