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CHAPTER 12 THE CELL CYCLE

CHAPTER 12 THE CELL CYCLE. Introduction. Reproduction =continuity of life. Calculate the Surface Area:Volume Ratios for the cubes below. (SA:V) SA= l x w x 6 V= l x w x h. #1 1cm . # 2 2cm. #3 (3cm). SA= 6 cm 2 V= 1 cm 3 SA:V = 6:1. SA= 24 cm 2 V= 8 cm 3. SA= 54 cm 2

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CHAPTER 12 THE CELL CYCLE

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  1. CHAPTER 12THE CELL CYCLE

  2. Introduction Reproduction =continuity of life

  3. Calculate the Surface Area:Volume Ratios for the cubes below. (SA:V) SA= l x w x 6 V= l x w x h #1 1cm # 2 2cm #3 (3cm) SA= 6 cm2 V= 1 cm3 SA:V = 6:1 SA= 24 cm2 V= 8 cm3 SA= 54 cm2 V= 27 cm3 SA:V = 3:1 SA:V = 2:1

  4. Now, assume each CUBE is one CELL… As the “cell” gets larger………… • Does its surface area get greater? • Does its volume get greater? • Does it’s surface area:volume ratio get greater? • Does increased size become an advantage to the cell? Why or why not?

  5. In mammals, heat loss through the skin occurs naturally. Which of the following mammals would lose heat faster………... ….….Why?

  6. Think back to the Elephant and the Mouse……do you want to change your answer? Which animal will lose heat the fastest?

  7. If you said the mouse, you are right!!! The mouse would lose heat faster due to it’s Surface Area:Volume Ratio

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