Cell Division! 3.1: Cell division occurs in all organisms.

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©1999 Timothy G. Standish Mitosis Cell Division Timothy G. Standish, Ph. D.

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Presentation transcript:

Cell Division! 3.1: Cell division occurs in all organisms

Do Now!!  What happens when you get cut? Explain in your own words what happens when you are cut and the healing process.

Objectives To identify various reasons for cell division To define chromosomes and identify their importance To relate surface area : volume ratio to reasons for cell division

Cellular Division Cell division occurs in all organisms: Performs different functions Unicellular organisms (ex: bacteria): Binary fission: division into 2 identical cells (clone) Multicellular organisms (ex: US!): Mitosis Binary fission Mitosis

Cellular division videos Binary fission: https://www.youtube.com/watch?v=Th4v_Q1iHfY Mitosis: https://www.youtube.com/watch?v=AhgRhXl7w_g

Cell division is involved in growth, development and repair All organisms start as a single cell: Growth: limited by surface area (needs high ratio of surface area to volume) Cells are limited in size: Nutrients in and wastes out through membrane If cell grows too big, not enough material can cross membrane fast enough So the cell divides!

Worksheet!!

Do Now!!  What is the surface area to volume ratio of a cube with a 3 cm length? Would this be ideal for the cell? Explain why or why not.

Objectives To discuss how cell division is involved with development and repair. To identify the steps of mitosis.

Cell division is involved in growth, development and repair (cont.) c) Development: Makes specialized cells- cells modified for particular functions Ex: blood cell, nerve cells, muscle cells

Cell division is involved in growth, development and repair (cont.) Heals cuts and any wounds Cells divide and fill up space to close the wound As cells age and die, they need to be replaced.

DNA – DeoxyriboNucleic Acid A chemical that contains information for an organism’s growth and functions: Has directions for how to make proteins! Double helix like a twisted ladder Eukaryotes: located in nucleus

Chromosome Structure DNA coils around histones (proteins) to form nucleosomes This coils to form chromatin fibers The chromatin fibers supercoil to form chromosomes that are visible in the metaphase stage of mitosis.

We have 46 total chromosomes= 23 pairs

Question Even when you are done growing and development appears to stop, is cell division still occurring?