04 cell cycle -rgh0

04 cell cycle -rgh0 - T he Cell Cycle Chapt er 11...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 11 The Cell Cycle Lectures by Cheryl Ingram-Smith Biological Science, Third Edition – Scott Freeman
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
Key Concepts After chromosomes are copied, mitosis distributes one chromosome copy to each of two daughter cells. Mitosis and cytokinesis produce two cells that are identical to the parent cell. Over their life span, eukaryotic cells go through a cycle that consists of four carefully controlled phases. In multicellular organisms, uncontrolled cell growth leads to cancer. Different types of cancer result from different types of defects in control over the cell cycle.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Learning Outcomes Compare the changes that occur in each phase of the cell cycle. Distinguish between plant and animal mitosis Describe the role of cyclin-dependent kinases and cyclins in the cell cycle. Relate defects in control over the cell cycle to cancer.
Background image of page 4
Interphase Chromosome replication occurs only during interphase and not during M phase. The stage in which DNA replication occurs is called the synthesis (S) phase . Interphase also includes two gap phases, during which no DNA synthesis occurs. The first gap, G 1 phase , occurs before the S phase. The second gap, G 2 phase , occurs between
Background image of page 5

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

View Full DocumentRight Arrow Icon
An Overview of Mitosis
Background image of page 6
Chromosome Morphology and M itosis Condensed replicated chromosome The DNA condenses around its associated proteins, resulting in a compact chromosome that is 10,000 times shorter than its original length. Copies of same chromosome, condensed Centromere Chromatid Chromatid } Chromosome
Background image of page 7

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

View Full DocumentRight Arrow Icon
Background image of page 8
Figure 9.6 DNA Packs into a Mitotic Chromosome
Background image of page 9

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

View Full DocumentRight Arrow Icon
The Cell Cycle Has Four Phases Mitosis
Background image of page 10
Cell Cycle Two phases: mitosis and interphase. Interphase is the period between divisions. A typical eukaryotic cell will spend most of its life in interphase (G1, S and G2). It takes a cell about 24 hours to complete one cell cycle. G 1 phase lasts 7–9 hours. S phase lasts 6–8 hours. G 2 phase lasts 4–5 hours. DNA is replicated during the S phase as are the centrosomes Most of a cell’s life is spent in interphase. Human nerve and muscle cells
Background image of page 11

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

View Full DocumentRight Arrow Icon
Centrosomes Duplicate in S phase. In animal cells contains two centrioles. Separate and move to opposite ends of the nuclear envelope. Aster rays and spindle fibers
Background image of page 12
G 1 S PHASE AND G 2 MITOSIS Sister chromatids Parent cell: 4 replicated chromosomes Replicated chromosomes condense at the start of mitosis. Parent cell: 4 unreplicated chromosomes Chromosomes are shown partially condensed to make them visible During mitosis, sister chromatids separate. Two daughter cells are formed by cytokinesis. Daughter cells
Background image of page 13

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

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/11/2011 for the course BIO 182 taught by Professor Richardholloway during the Spring '11 term at N. Arizona.

Page1 / 59

04 cell cycle -rgh0 - T he Cell Cycle Chapt er 11...

This preview shows document pages 1 - 14. Sign up to view the full document.

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