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Sexual Reproduction In Animals


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Regents Biology notes on sexual reproduction in animals

Sexual Reproduction In Animals

  1. 1. Sexual Reproduction in Animals Gamete – egg Gonad – ovary Few to many eggs - oogenesis Egg cells are (n) haploid/monoploid Gamete – sperm Gonad – testes Many sperm cells - spermatogenesis Sperm cells are(n) haploid/monoploid Female Male
  2. 2. Egg *Larger than a body cell *Cannot move on its own *Round shape Sperm *Smaller *Swims through liquid *Head, middle, & tail (flagellum)
  3. 3. Fertilization <ul><li>Sperm nucleus enters the egg and moves to the egg nucleus. The 2 nuclei join together and then form a zygote . </li></ul>
  4. 4. External Fertilization *outside the body <ul><li>Animals that breed in the water </li></ul><ul><li>Many hazards in the environment </li></ul><ul><ul><li>Sperm and egg may not meet </li></ul></ul><ul><ul><li>Eggs or offspring may be eaten </li></ul></ul><ul><ul><li>May die due to environmental conditions </li></ul></ul><ul><ul><ul><li>Temperature </li></ul></ul></ul><ul><ul><ul><li>Oxygen level </li></ul></ul></ul>
  5. 5. <ul><li>Large number of sperm and egg are released to overcome hazards </li></ul><ul><li>Hormones control behavior to have sperm and egg released at the same time. </li></ul>
  6. 6. Internal Fertilization *within the female body <ul><li>Land animals </li></ul><ul><li>Some aquatic animals </li></ul><ul><ul><li>Shark </li></ul></ul><ul><ul><li>Octopus </li></ul></ul>
  7. 7. <ul><li>Requires specialized sex organ to carry sperm to body of female </li></ul><ul><li>Watery environment needed for sperm to swim to the egg </li></ul>
  8. 8. <ul><li>After fertilization, zygote is enclosed in a protective shell and released OR remains and develops in female body </li></ul>Zygote Turtle laying eggs
  9. 9. <ul><li>Internal Fertilization </li></ul><ul><ul><li>Fewer eggs needed </li></ul></ul><ul><ul><li>Well protected </li></ul></ul><ul><ul><li>Increased chance of fertilization </li></ul></ul><ul><ul><li>Parthenogenesis – development of unfertilized egg into an adult.- Bees & Wasps </li></ul></ul>