Cell Growth 10 1 Topic Cell Growth and

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Cell Growth 10. 1 • Topic: Cell Growth and Cell Division • Learning Target:

Cell Growth 10. 1 • Topic: Cell Growth and Cell Division • Learning Target: I can explain the reasons, that cells grow and divide.

Cell Growth: 10. 1 1. Information overload. • DNA stores critical information • This

Cell Growth: 10. 1 1. Information overload. • DNA stores critical information • This information is use to synthesize molecules for cell growth. • Increase information demands, limits the cell growth. • Grow without limit, information crisis would occur. Example; A library in a growing town.

Cell Growth: 10. 1 2. Exchanging Materials • Food, oxygen, water, and waste enter

Cell Growth: 10. 1 2. Exchanging Materials • Food, oxygen, water, and waste enter in and out through the cell membrane. • The rate of this exchange, depends on the surface area of a cell. • The rate that nutrients are used and waste are produce, depends on the cell’s volume. Traffic Problems

Cell Growth: 10. 1 3. Ratio of Surface Area to Volume • When the

Cell Growth: 10. 1 3. Ratio of Surface Area to Volume • When the cell…… • Volume increases faster than its surface area • The ratio of surface area to volume decreases. • If a cell gets too large, the surface are of the cell is not large enough to get enough oxygen and nutrients in and waste out.

Division: 10. 1 4. Cell Division • Cell divides before it get too large.

Division: 10. 1 4. Cell Division • Cell divides before it get too large. • Copies DNA before divides • Divides into two new daughter cells. • Reduces cell’s volume • Increases ration of surface area to volume.

Reproduction: 10. 1 • Topic: Reproduction • Learning Target: I can compare and contrast

Reproduction: 10. 1 • Topic: Reproduction • Learning Target: I can compare and contrast asexual reproduction to sexual reproduction.

Reproduction: 10. 1 Asexual reproduction • Single parent production an offspring. • Offspring genetically

Reproduction: 10. 1 Asexual reproduction • Single parent production an offspring. • Offspring genetically identical to parent (most cases). • More efficient way to produce offspring. • Reproduction is quick and produces large number of offspring. • Prokaryotic and eukaryotic single celled organisms are reproduce asexually. • Many multicellular organisms can reproduce asexually.

Reproduction: 10. 1 Examples of Asexual Reproduction Bacteria reproduce by binary fission Kalanchoe plants

Reproduction: 10. 1 Examples of Asexual Reproduction Bacteria reproduce by binary fission Kalanchoe plants form plantlets. Hydras reproduce by budding

Reproduction: 10. 1 Sexual Reproduction • Offspring are produce by two parents • Fusion

Reproduction: 10. 1 Sexual Reproduction • Offspring are produce by two parents • Fusion of two sex cells • Offspring inherit genetic information from both parents • Offspring are more genetically diverse • Genetic diversity helps ensure survival of species when environment changes

Reproduction: 10. 1 Examples of sexual reproduction • Most animals and plants, and many

Reproduction: 10. 1 Examples of sexual reproduction • Most animals and plants, and many single-celled organisms reproduce sexually