Asexual Vs Sexual Reproduction

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Asexual Vs Sexual Reproduction

  1. 1. Asexual vs. Sexual Reproduction
  2. 2. Asexual Reproduction <ul><li>A form of reproduction which does not involve meiosis or fertilization. </li></ul><ul><li>Involves one parent. </li></ul><ul><li>The primary form of reproduction for single-celled organisms such as archaea, bacteria, and protists. </li></ul><ul><li>Many plants and fungi reproduce mostly asexually as well. </li></ul>
  3. 3. Binary Fission <ul><li>Cell splits and replicated DNA goes with each part </li></ul><ul><li>Prokaryotes, Bacteria </li></ul>
  4. 4. Bacterial Conjugation <ul><li>A bacteria shoots out a tube and sends a piece of its DNA to another bacteria </li></ul><ul><li>Bacteria </li></ul>
  5. 5. Fragmentation/Regeneration <ul><li>Body of parent breaks and produces offspring </li></ul><ul><li>Fungi, moss, sea stars, planarian </li></ul>
  6. 6. Budding <ul><li>Offspring grows out of parent </li></ul><ul><li>Yeast, hydras </li></ul>
  7. 7. Sexual Reproduction <ul><li>Results in increasing genetic diversity of the offspring. </li></ul><ul><li>Characterized by two processes: </li></ul><ul><ul><li>meiosis, halving of the number of chromosomes </li></ul></ul><ul><ul><li>fertilization, combination of two gametes and the restoration of the original number of chromosomes </li></ul></ul><ul><li>During meiosis, chromosomes usually cross over = genetic recombination. </li></ul><ul><li>Primary method of reproduction for the vast majority of visible organisms, including almost all animals and plants. </li></ul>
  8. 8. Pollination <ul><li>Pollen is delivered to female part of plant </li></ul><ul><li>Flowering plants </li></ul>
  9. 9. Sexual Reproduction <ul><li>DNA from 2 individuals merge to form one </li></ul><ul><li>Animals, Plants </li></ul>
  10. 10. Mechanisms of Sexual Reproduction
  11. 11. External Fertilization <ul><li>Getting gametes together </li></ul><ul><ul><li>Eggs are shed by the female and fertilized by the male </li></ul></ul><ul><ul><li>Requires an environment where an egg can develop without desiccation or heat stress  occurs almost exclusively in moist habitats </li></ul></ul><ul><ul><li>Most fishes and amphibians </li></ul></ul>
  12. 12. Internal Fertilization <ul><li>Getting gametes together </li></ul><ul><ul><li>Occurs when the sperm are deposited in (or nearby) the female reproductive tract; egg and sperm unite within the female’s body </li></ul></ul><ul><ul><li>Requires cooperative behavior that makes copulation possible, as well as sophisticated reproductive systems </li></ul></ul>
  13. 13. Protection of the Embryo <ul><li>External Fertilization </li></ul><ul><ul><li>Enormous numbers of zygotes produced; only a few survive </li></ul></ul><ul><li>Internal Fertilization </li></ul><ul><ul><li>Produces fewer zygotes wherein more survive </li></ul></ul><ul><li>Resistant eggs, development of embryo within the reproductive tract of female parent, parental protection of eggs </li></ul>

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