HW # 57- Begin Cornell Notes, Chapter 4, Section 3 p. 129-134 Warm up How do cells grow and divide?...
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Transcript of HW # 57- Begin Cornell Notes, Chapter 4, Section 3 p. 129-134 Warm up How do cells grow and divide?...
HW # 57- Begin Cornell Notes, Chapter 4, Section 3 p. 129-134
Warm up How do cells grow and divide?
Week 18, Day One
How & Why Cells DivideCell Division can be broken up into 2 categories:
• Produce new cells, IDENTICAL to the original
MITOSIS
• Produce new cells, with HALF of the information of the original
MEIOSIS
Why Cells Divide20 µm100 µm 200 µm
(a) Reproduction. An amoeba, a single-celled eukaryote, is dividing into two cells. Each new cell will be an individual organism (LM).
(b) Growth and development. This micrograph shows a sand dollar embryo shortly after the fertilized egg divided, forming two cells (LM).
(c) Tissue renewal. These dividing bone marrow cells (arrow) will give rise to new blood cells (LM).
Mitosis Mitosis Mitosis
How Cells Divide:The Cell Cycle
• The cell cycle consists of– Interphase – normal cell activity– The mitotic phase – cell division
INTERPHASE
Growth
G 1
(DNA synthesis)
Growth
G2
Cel
l Div
sion
• DNA- contains all of the information that your cell needs (kind of like a textbook)
Animated Mitosis Cyclehttp://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase
• Cytokinesis