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Sci 9 Lesson 6 April 12 - Sexual Reproduction
 

Sci 9 Lesson 6 April 12 - Sexual Reproduction

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    Sci 9 Lesson 6 April 12 - Sexual Reproduction Sci 9 Lesson 6 April 12 - Sexual Reproduction Presentation Transcript

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