Presentation on theme: "1 Review Identify two reasons why a cell’s growth is limited"— Presentation transcript:
1 1 Review Identify two reasons why a cell’s growth is limited Explain As a cell’s size increases, what happens to the ration of its surface area to volume ratioApplying Concepts Why is a cell’s surface to volume ratio important2 Visual Thinking The formula for finding the surface of area of a sphere is A=4πr2. The formula for finding the volume of a sphere is V=4/3r3.Calculate the surface areaand the volume for the baseballand basketball. Then write theratio of surface are to volume for each.Baseball r = 3.6 cm Basketball r = 12.2 cm
2 Ch 10 Cell Growth and Division 10.1 Cell Growth, Division, and Reproduction
3 Limits to Cell SizeThe larger a cell becomes, the more demands the cell places on its DNA.The larger a cell grows the less efficient in moving nutrients and waste materials across its cell membrane.
4 DNA Information is used to build the molecules needed for cell growth The bigger the cell- the more the information is needed.
5 Exchanging Materials Nutrients and wastes pass through cell membrane The greater surface area the more materials that can passKey is surface area to volume.
6 Cell Division The splitting of a larger cell into two “daughter” cells Cell makes a second copy of its DNAReduces cell volume so it increases surface area to volume ratio.
7 Asexual Reproduction Involves a single parent Produces genetically identical offspringSimple, efficient, and effective to produce many offspringBinary fission and budding.
8 Good and Bad of Asexual Reproduction SimpleDon’t need to find a mateQuickNo genetic variability.
9 Sexual ReproductionOffspring are produced by the fusion of two sex cells one from each of two parentsOffspring are genetically differentMost animals and plants, and many single-celled organisms.
10 Good and Bad of Sexual Reproduction Increased variabilityGenerally need two individualsMore complexGreater investment.