the cell cycle

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The Cell Cycle LN #14

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The Cell Cycle. LN #14. The Cell Theory. All cells come from preexisting cells. Cell division has two major roles in the life cycle of multicellular organisms. Allows organisms to develop from a fertilized egg to an embryo and then to an adult. - PowerPoint PPT Presentation

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Page 1: The Cell Cycle

The Cell Cycle

LN #14

Page 2: The Cell Cycle

The Cell Theory All cells come from preexisting cells. Cell division has two major roles in the life

cycle of multicellular organisms.Allows organisms to develop from a fertilized

egg to an embryo and then to an adult.Allows life to continue through the production

of sperm and eggs.

Page 3: The Cell Cycle

Eukaryotes have chromosomes

Chromosomes are made of DNA and protein.

They are located in the nucleus.

Chromosomes are visible under the microscope only when the cell is dividing.

When a cell is not dividing they are in a tangled mass called chromatin.

Page 4: The Cell Cycle

Number of Chromosomes

The somatic cells (all the body cells except sperm or eggs) contain a characteristic number of chromosomes.Human somatic cells have 46 chromosomes. Human sperm and egg cells have 23

chromosomes. Every somatic cell (body cell) in your body has

the same DNA. Cells are specialized and only use part of the

DNA for their specific job.

Page 5: The Cell Cycle

The Cell Cycle

Interphase cell grows chromosomes duplicate cell parts are made 90% of cell cycle time

Mitosis cell division

Cytokinesis cytoplasm divides in two

Page 6: The Cell Cycle

Chromosomes Duplicate and Split

Before the cell begins to divide the cell makes a copy of its chromosomes.

Duplication results in two identical structures called sister chromatids.

When cell divides sister chromatids are separated. Sister

chromatids

Page 7: The Cell Cycle

Interphase is a period of cell growth and DNA replication

Prophase Chromatid coils to form chromosomes. Nuclear envelope is gone. Spindle fibers move chromosomes to the center.

Page 8: The Cell Cycle

Metaphase Chromosomes line upin the Middle.

Anaphase Chromosomes are pulledApart.

Telophase Two cells are formed.

I Pee Mondays And Tuesdays

Page 9: The Cell Cycle

Summary

What are chromosomes made of Where are chromosomes located? What are the different parts of the cell

cycle? What is mitosis? What are the different phases of

mitosis?

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