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AIM: How is the continuity of life sustained? (ILS LEKI#4)

AIM: How is the continuity of life sustained? (ILS LEKI#4). 4/18/13 DO NOW: Pick up your quiz and finish it. HOMEWORK: Read p. 45-47 in your ILS Review Book Answer Questions #1-31 on your scantron DUE- Tomorrow Morning by 8 AM.

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AIM: How is the continuity of life sustained? (ILS LEKI#4)

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  1. AIM: How is the continuity of life sustained? (ILS LEKI#4) 4/18/13 DO NOW: • Pick up your quiz and finish it HOMEWORK: • Read p. 45-47 in your ILS Review Book • Answer Questions #1-31 on your scantron DUE- Tomorrow Morning by 8 AM

  2. Base your answers to questions 1-3 on the Punnett square below and on your knowledge of science. The Punnett square shows a cross between a mouse with black fur whose genetic makeup was BB, and a mouse with white fur whose genetic makeup was bb. • Explain why all of the offspring have black fur, even though each of them has a gene for white fur. • A second cross was done using a different pair of mice. One parent was a mouse with white fur (bb). The other parent was a mouse with black fur. Some of the offspring produced from this cross had white fur. What genetic makeup did this parent with black fur have in order to produce some offspring with white fur? • Create a punnett square using the offspring from the first cross What percentage of the offspring were Black? White?

  3. How does a species make sure that the species continues to exist? • Reproduction How isasexual reproduction different from sexual reproduction? • Asexual reproduction = 1 parent • Sexual Reproduction = 2 parents

  4. What are the types of asexual reproduction? • Binary Fission • Spores • Budding • Mitosis

  5. Fertilization Explain how sexual reproduction occurs? • The combining (fertilization) of the male sex cell (Sperm) and the female sex cell (Egg) How many chromosomes are contained in a human sex cell? • 23 How does fertilization produce a zygote with 46 chromosomes? • 23 from mom (egg) • 23 from dad (sperm)

  6. What is a zygote? • The new one-celled offspring resulting from fertilization. How do we go from one cell to billions of cells? • Mitosis

  7. How do plants reproduce? • Flowers Identify the male and female part of the flower. • Male = stamen • Female = pistil

  8. How does pollination occur? • Pollen Grain (male) falls on the stigma (female). • Sperm cells from the pollen grain move thru the pollen tube into the ovary. • The sperm fertilizes the egg

  9. What is a seed? A seed the the fertilized zygote of the plant. Describe the structure of a seed? • Zygote (young plant) • Stored food • Seed coat Why does the seed contain stored food? • The stored food provides nourishment from germination to seedling when leaves are fully developed

  10. What is metamorphosis? • A series of extreme changes from young to adult Describe the Life cycle of frog. • Egg – tadpole – adult frog Describe the Life cycle of a beetle. • Egg – larva – pupa – adult beetle

  11. The hydra shown below is reproducing asexually. What percentage of the offspring’s genetic information is the same as the genetic information of the parent?

  12. Frogs live most of their lives in and around water. During the tadpole stage, they live entirely underwater and get oxygen through their gills. As adults, frogs can live on land and breathe air. • Identify one structural change to this organism’s body that occurs during its life cycle. • An environmental change causes a decrease in the amount of oxygen that is dissolved in the pond water. Explain why this change would have a greater effect on the frog during the tadpole stage than during the adult stage.

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