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Asexual Reproduction in Protists & Monerans AND Comparing Sexual & Asexual Reproduction

Asexual Reproduction in Protists & Monerans AND Comparing Sexual & Asexual Reproduction. BY: BRIANNA SHIELDS January 31, 2006. DO NOW. 1. A body structure of behavior that makes an organism a better competitor or more fit in their environment is known as…

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Asexual Reproduction in Protists & Monerans AND Comparing Sexual & Asexual Reproduction

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  1. Asexual Reproduction in Protists & Monerans ANDComparing Sexual & Asexual Reproduction BY: BRIANNA SHIELDS January 31, 2006

  2. DO NOW • 1. A body structure of behavior that makes an organism a better competitor or more fit in their environment is known as… • 2. Similar body parts between very different organisms, which suggest a common ancestor are known as……. • 3. A change in a species over time is called……… • HAVE YOUR ESSAY OUT ON YOUR DESK

  3. GOAL • To compare sexual and asexual reproduction in animals, protists and monerans

  4. Sexual Reproduction in Animals 1. Animals, some plants, fungi, protists 2. 2 parents= male & female 3. Gametes Male= sperm Female= egg Animals: Sexual Reproduction

  5. Sexual Reproduction Process: Sperm fertilizes egg to form zygote (single cell) Tough coating forms on egg (blocks other sperm) Zygote divides repeatedly until it forms an embryo

  6. Sexual Reproduction Process: Embryo develops into a fetus (begins to look like parents) Offspring is born

  7. Sexual Reproduction Diagram • Create a flow chart with pictures to explain the process of sexual reproduction. Label the sperm, egg, zygote, cell division, embryo & fertilization point

  8. Fertilization Animation

  9. Fertilization Animation

  10. Sexual Reproduction in Animals 3. Place of fertilization External = outside body (fish, amphibians) Internal= in female’s body (birds, reptiles, mammals) Animals: Sexual Reproduction

  11. Sexual Reproduction in Animals 4. Number of offspring tends to correspond to number of eggs female produces at one time Animals: Sexual Reproduction

  12. Humans- 1 Elephant/horse- 1 Cat- 4/5 Dog- 1/12 Numbers of offspring

  13. Sexual Reproduction in Animals 5. Appearance of offspring a. Two parents b. Two sets of chromosomes c. Two sets of genes d. Genes mix- traits from both parents Animals: Sexual Reproduction

  14. Sexual Reproduction in Animals 6. Number of chromosomes In human body cells = 46 chromosomes In human sex cells = 23 chromosomes Animals: Sexual Reproduction

  15. Sexual Reproduction in Animals 7. Egg (23) + sperm (23) = 46 chromosomes Animals: Sexual Reproduction

  16. Sexual Reproduction in Animals 8. Once fertilization is completed, zygote divides by mitosis (asexual reproduction) Animals: Sexual Reproduction

  17. Describe the process of fertilization Review: Sexual Reproduction in Animals

  18. Why does only one sperm usually enter the egg cell? When the first sperm enters the egg cell, a tough wall covering develops around it Review: Sexual Reproduction in Animals

  19. Describe the development of an organism immediately after fertilization Review: Sexual Reproduction in Animals

  20. Compare the number of chromosomes in sex cells with the number of chromosomes in body cells Review: Sexual Reproduction in Animals

  21. Asexual Reproduction Protists Monerans Developing/growing animals, plants and fungi Asexual Reproduction Methods

  22. Binary Fission 1. Bacteria 2. Organism divides in half 3. 2 identical daughter cells produced (half the size of their parent) 4. Daughter grows to parental size- then divides Asexual Reproduction Methods

  23. Binary Fission Images

  24. Binary Fission Images

  25. Binary Fission Clips

  26. Budding 1. Small bud grows out of parent cell (with identical DNA) 2. Bud breaks off when large enough 3. 2 cells of different sizes produced 4. Ex: yeast & hydra Asexual Reproduction Methods

  27. Hydra Budding Images

  28. Regeneration 1. Living things repair themselves by growing lost body parts from remaining cells 2. Ex: lobsters, starfish, lizards Asexual Reproduction Methods

  29. Regeneration Pictures

  30. Comparing Asexual & Sexual Reproduction • Create a T-chart to compare the following: • How many parents? • Are sex cells needed? Which ones? • What numbers of chromosomes are involved? (at the beginning and at the end) • Are offspring different from or identical to parents and why? • What signals the beginning of each process?

  31. ASEXUAL One parent No sex cells 46 --> 46 Cells produced are identical to the parent- no gene mixing Begins by cell division (mitosis) SEXUAL Two parents Sex cells necessary (sperm and egg) 23 + 23 --> 46 Cells produced are different from their parents- due to gene mixing Begins by fertilization Comparing Reproduction Types

  32. Websites • Animal Reproduction Animations • Animal Life Cycles

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