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Homework from last class: <ul><li>Complete the Meiosis cut and paste worksheet activity </li></ul><ul><li>Complete 6-1B ac...
Chapter 6 pp. 204-220 Ch. 6.2  Sexual Reproduction
Sexual Reproduction <ul><li>What is  sexual reproduction ? </li></ul><ul><li>Sexual reproduction  brings non-identical gam...
Methods of Fertilization <ul><li>External  or  Internal Fertilization </li></ul><ul><li>In order for external or internal ...
External Fertilization <ul><li>external fertilization:  sperm and egg join outside parents’ bodies </li></ul><ul><li>Advan...
Internal Fertilization <ul><li>internal fertilization:  sperm and egg join inside parents, embryo is    nourished inside m...
Pollination <ul><li>Pollination:  transfer of male gametes ( pollen ) from male reproductive parts of a plant to the femal...
Video – “Life’s Greatest Miracle”
<ul><li>Embryonic development:  the early development of an organism </li></ul><ul><li>(the first 2 months after fertiliza...
Fetal Development <ul><li>Differentiation:  the process where cell layers form the organs and tissues of a baby; divided i...
Sexual Reproduction: Advantages and Disadvantages p. 220
Homework for next class: <ul><li>Complete Sexual Reproduction crossword puzzle </li></ul><ul><li>Complete Check Your Under...
Works Cited <ul><li>Images taken from the following sources: </li></ul><ul><li>http://www.genetics.com.au/factsheet/fs30.a...
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Sci 9 Lesson 6 April 12 - Sexual Reproduction

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Sci 9 Lesson 6 April 12 - Sexual Reproduction

  1. 1. Homework from last class: <ul><li>Complete the Meiosis cut and paste worksheet activity </li></ul><ul><li>Complete 6-1B activity on p. 197 </li></ul>Trisomy 18 karyotye
  2. 2. Chapter 6 pp. 204-220 Ch. 6.2 Sexual Reproduction
  3. 3. Sexual Reproduction <ul><li>What is sexual reproduction ? </li></ul><ul><li>Sexual reproduction brings non-identical gametes together to form a new organism . </li></ul><ul><li>Occurs in 3 stages : </li></ul><ul><li>Mating - the process by which gametes are </li></ul><ul><li>bought together at same place and same </li></ul><ul><li>time </li></ul><ul><li>Fertilization - process by which egg and </li></ul><ul><li>sperm join to form a new organism </li></ul><ul><li>Development - the process by which an </li></ul><ul><li>organism develops as an embryo </li></ul>pp. 204 - 206
  4. 4. Methods of Fertilization <ul><li>External or Internal Fertilization </li></ul><ul><li>In order for external or internal fertilization to produce a successfully developing embryo, certain conditions must be met : </li></ul><ul><li>The embryo must have enough nutrients. </li></ul><ul><li>The temperature must not be too cold </li></ul><ul><li>or too hot. </li></ul><ul><li>There must be enough moisture so that </li></ul><ul><li>the embryo does not dry out. </li></ul><ul><li>The embryo must be protected from </li></ul><ul><li>predators and items in the environment </li></ul><ul><li>that can potentially harm it. </li></ul>p. 207 A dog embryo
  5. 5. External Fertilization <ul><li>external fertilization: sperm and egg join outside parents’ bodies </li></ul><ul><li>Advantages </li></ul><ul><li>Very little energy required to mate </li></ul><ul><li>Large numbers of offspring produced </li></ul><ul><li>Offspring can be spread widely in the environment - less competition between each other and parents </li></ul><ul><li>Disadvantages </li></ul><ul><li>Many gametes will not survive </li></ul><ul><li>Many eggs will not be fertilized </li></ul><ul><li>Offspring are often not protected by parents, so many of them die </li></ul>pp. 208 - 209 External fertilization in frogs
  6. 6. Internal Fertilization <ul><li>internal fertilization: sperm and egg join inside parents, embryo is nourished inside mother </li></ul><ul><li>Advantages </li></ul><ul><li>Embryo protected from predators </li></ul><ul><li>Offspring more likely to survive, as many species will protect their them while they mature </li></ul><ul><li>Disadvantages </li></ul><ul><li>Much more energy required to find mate </li></ul><ul><li>Fewer zygotes produced, resulting in less offspring </li></ul><ul><li>More energy required to raise and care for offspring </li></ul>p. 210 - 211 Internal fertilization in sea turtles
  7. 7. Pollination <ul><li>Pollination: transfer of male gametes ( pollen ) from male reproductive parts of a plant to the female reproductive parts of a plant ( ovules ) </li></ul><ul><li>A form of internal fertilization in plants. </li></ul><ul><li>Pollen can be carried by wind or other organisms . </li></ul>pp. 212 - 214 Stamen: male reproductive organ Pistil: female reproductive organ
  8. 8. Video – “Life’s Greatest Miracle”
  9. 9. <ul><li>Embryonic development: the early development of an organism </li></ul><ul><li>(the first 2 months after fertilization in humans) </li></ul><ul><li>Stages </li></ul><ul><li>End of the first week - ball of cells called morula </li></ul><ul><li>End of second week - hollow ball </li></ul><ul><li>called a blastula </li></ul><ul><ul><li>Cells at this stage are stem cells , and have the ability to develop into any kind of cell </li></ul></ul><ul><li>In the next stage the embryo is known as a gastrula and develops </li></ul><ul><li>3 layers: </li></ul><ul><li>ectoderm (skin, nerves) mesoderm (muscles, bones) endoderm (lungs, liver, digestive system lining) </li></ul>Embryonic Development pp. 216 - 217
  10. 10. Fetal Development <ul><li>Differentiation: the process where cell layers form the organs and tissues of a baby; divided into 3 trimesters. </li></ul><ul><li>First Trimester (0-12 weeks) </li></ul><ul><li>Organ systems begin to develop and form. Bone cells form. </li></ul><ul><li>Second Trimester (12-24 weeks) </li></ul><ul><li>Rapid growth from 12-16 weeks. </li></ul><ul><li>Third Trimester (24+ weeks) </li></ul><ul><li>Continued growth, especially of brain. Fat begins to deposit at 32 weeks to keep fetus warm at birth. </li></ul>pp. 218 - 219
  11. 11. Sexual Reproduction: Advantages and Disadvantages p. 220
  12. 12. Homework for next class: <ul><li>Complete Sexual Reproduction crossword puzzle </li></ul><ul><li>Complete Check Your Understanding Qs on p. 223: </li></ul><ul><li>#s 1, 2, 6, 13, 14, 15, 16 </li></ul><ul><li>Read over class notes and check class blog </li></ul><ul><li>http://www.msoonscience.blogspot.com </li></ul>
  13. 13. Works Cited <ul><li>Images taken from the following sources: </li></ul><ul><li>http://www.genetics.com.au/factsheet/fs30.asp </li></ul><ul><li>http://idle.slashdot.org/story/09/02/12/1647241/Zoo-Offers-Erotic-Tour-For-Valentines-Day </li></ul><ul><li>http://www.emailvariety.com/tag/dolphin/ </li></ul><ul><li>http://www.turtles.org/i3404006.jpg </li></ul><ul><li>http://www.teachersdomain.org/asset/oer08_img_flowerimage/ </li></ul><ul><li>http://mydcdoctor.com/custom_content/c_137923_first_trimester.html </li></ul><ul><li>http://ethics.davidson.edu/index.php/2010/02/the-moral-status-of-human-embryos/ </li></ul>

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