CELL CYCLE The Cell Cycle Cells undergo an

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CELL CYCLE

CELL CYCLE

The Cell Cycle • Cells undergo an orderly sequence of events as they grow

The Cell Cycle • Cells undergo an orderly sequence of events as they grow and divide. • The sequence in the following slides show a typical cell cycle of an animal cell. • The end result are two “daughter cells. ” • Each will then begin the cell cycle again.

Length of the Human Liver Cell Cycle

Length of the Human Liver Cell Cycle

Chromosomes and DNA • Chromosome structures of DNA and proteins • Gene a section

Chromosomes and DNA • Chromosome structures of DNA and proteins • Gene a section on a chromosome that has genetic information for a trait • DNA deoxyribonucleic acidgenetic material

Phase One INTERPHASE The period during the cell cycle of a cell’s growth and

Phase One INTERPHASE The period during the cell cycle of a cell’s growth and development. Most cells go through three stages: 1. Rapid growth and replication 2. Copying DNA 3. Preparation for cell division

During Interphase, the cell grows, makes a copy of its DNA, and prepares to

During Interphase, the cell grows, makes a copy of its DNA, and prepares to divide into two cells.

Phase 2 MITOSIS BEGINS

Phase 2 MITOSIS BEGINS

Chromatin in the nucleus condenses to form chromosomes. The pairs of centrioles move to

Chromatin in the nucleus condenses to form chromosomes. The pairs of centrioles move to opposite sides of the nucleus. Spindle fibers form a bridge between the ends of the cell. The nuclear envelope breaks down.

The chromosomes line up across the center of the cell. Each chromosome attaches to

The chromosomes line up across the center of the cell. Each chromosome attaches to a spindle fiber at its centromere.

The centromeres split. The two chromatids separate, and each chromatid becomes a new chromosome.

The centromeres split. The two chromatids separate, and each chromatid becomes a new chromosome. The new chromosomes move to opposite ends of the cell. The cell stretches out as the opposite ends are pushed apart.

The chromosomes begin to stretch out and lose their rod-like appearance. A new nuclear

The chromosomes begin to stretch out and lose their rod-like appearance. A new nuclear envelope forms around each region of chromosomes.

Stage 3 CYTOKINESIS

Stage 3 CYTOKINESIS

The cell membrane pinches in around the middle of the cell. The cell splits

The cell membrane pinches in around the middle of the cell. The cell splits in two. Each daughter cell ends up with an identical set of chromosomes and about half the organelles.

The Cell Cycle

The Cell Cycle

Results of Cell Division • Reproduction – Unicellular reproduction • Growth – Multicellular organism

Results of Cell Division • Reproduction – Unicellular reproduction • Growth – Multicellular organism • Replacement – Replaces worn out cells • Repair – Repairing damage to most cells

Cell Cycle I Cell Cycle The cell cycleCell Cycle I Cell Cycle The cell cycle
Cell Cycle Mitosis Cell Cycle Cell cycle repeatingCell Cycle Mitosis Cell Cycle Cell cycle repeating
The Cell Cycle The Cell Cycle Cell CycleThe Cell Cycle The Cell Cycle Cell Cycle
Cell Cycle Cell Cycle Cell proliferation Cell divisionCell Cycle Cell Cycle Cell proliferation Cell division
Cell Processes The CELL must undergo certain processesCell Processes The CELL must undergo certain processes
Cells Plant Animal Cells What are cells CellsCells Plant Animal Cells What are cells Cells
Cells Animal cells Plant cells Specialised cells OrganisationCells Animal cells Plant cells Specialised cells Organisation
Cells Animal cells Plant cells Specialised cells OrganisationCells Animal cells Plant cells Specialised cells Organisation
Cell Cycle Checkpo The cell cycle cells duplicateCell Cycle Checkpo The cell cycle cells duplicate
Cell Cycle The cell cycle describes the cellsCell Cycle The cell cycle describes the cells
CELL CYCLE How Cells Divide Cell Cycle NotesCELL CYCLE How Cells Divide Cell Cycle Notes
The Cell Cycle Cell Division Onion Cells CellThe Cell Cycle Cell Division Onion Cells Cell
You have learned That cells undergo division toYou have learned That cells undergo division to
You have learned that cells undergo division toYou have learned that cells undergo division to