Chapter 12 outline - Chapter 12: The Cell Cycle Cell...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 12: The Cell Cycle
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cell division functions in reproduction, growth, and repair. Cell Division - the reproduction of cells Cell Cycle - the life of a cell from its origin in the division of a parent cell until its own division into two Cell division enables unicellular organisms to divide themselves, forming two separate organisms, and also enables sexually reproducing organisms to develop from a single cell- the fertilized egg, or zygote. After an organism is fully grown, cell division continues to function in renewal and repair.
Background image of page 2
Cell division distributes identical sets of chromosomes to daughter cells A cell’s endowment of DNA is called its genome. Before a cell can divide, all of this DNA must be copied and then separated so that each daughter cell ends up with a complete genome. During the replication and distribution of DNA, the DNA molecules are packed into chromosomes . Each eukaryotic species has a characteristic number of chromosomes in each nucleus. Somatic cells – all body cells except the reproductive cells Gametes – sperm and egg cells
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chromosomes are duplicated and distributed in Mitosis , which is the division of the cell’s nucleus In each eukaryotic chromosome there is a long, linear DNA molecule representing hundreds of thousands of genes. The DNA is associated with various proteins that maintain the structure of the chromosome and help control the activity of genes. This DNA- protein complex, called chromatin , condenses after a cell duplicates its DNA in preparation for division. This allows us to see the chromosomes with a light microscope.
Background image of page 4
The Mitotic Cell Cycle Mitosis is just one part of the cell cycle. The mitotic (M) phase is usually the shortest part of the cell cycle. Mitotic cell division alternates with the much longer interphase , where the cell grows and copies its chromosomes. Interphase can be divided into subphases: -The G1 phase -The S phase (DNA synthesis) -The G2 phase During all three subphases, the cell grows by producing proteins and cytoplasmic organelles.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
• Prophase
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/02/2009 for the course SCI 90210 taught by Professor Durkka during the Spring '09 term at École Normale Supérieure.

Page1 / 17

Chapter 12 outline - Chapter 12: The Cell Cycle Cell...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online