04 cell cycle -rgh0

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

Info icon This 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
Image of page 1

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

View Full Document Right Arrow Icon
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.
Image of page 3

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

View Full Document Right 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.
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
Image of page 5

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

View Full Document Right Arrow Icon
An Overview of Mitosis
Image of page 6
Chromosome Morphology and Mitosis 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
Image of page 7

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

View Full Document Right Arrow Icon
Image of page 8
Figure 9.6 DNA Packs into a Mitotic Chromosome
Image of page 9

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

View Full Document Right Arrow Icon
The Cell Cycle Has Four Phases Mitosis
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
Image of page 11

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

View Full Document Right 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
Image of page 12
An Overview of Mitosis 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.
Image of page 13

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

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

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern