• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Questions for Cell Cycle 1) Briefly describe all phases of the cell cycle and tell what happens in each.

Extracts from this document...

Introduction

The Cell Cycle Keila Woods Grand Canyon University BIO 100L January 19, 2011 The Cell Cycle Directions: Answer the following questions. Cite references as needed. Be sure to read the required Module 3 readings and view the required Web sites before completing the assignment. Cell Cycle Questions for Cell Cycle 1) Briefly describe all phases of the cell cycle and tell what happens in each. a) Interphase: Before a cell can enter cell division, it needs to take in nutrients. All of the preparations are done during the interphase. Interphase proceeds in three stages, G1 phase, S phase, G2 phase. Cell division operates in a cycle. Therefore, interphase is preceded by previous cycle mitosis and cytokinesis (Module 3 Reading). a. G1 phase: The cell increases the supply of proteins and increases its organelles. b. S phase: Linear chromosome is replicated. c. G2 phase: Increases protein preparing to replicate. b) M phase: this phase consist of nuclear division karyokinesis. ...read more.

Middle

Mitosis is used to repair and replace cells that wear out or die. 2) Briefly describe each phase of mitosis Prophase: nuclear envelope disintegrates, centrioles (microtubules) begin to form on both ends of the cell, and spindle fibers forming Metaphase: spindle fibers attach to centromere (centromere --> holds the sister chromatids together), chromosomes line up in the MIDDLE (connected to spindle fibers) Anaphase: the spindle fibers pull the sister chromatids apart and AWAY from each other to opposite ends of the cell. Telophase: nuclear envelope begins re-forming. Spindle fibers disappear, cell ready to separate into daughter cells (Krogh, 2009). 3) Describe and distinguish between replicated chromosomes and homologous chromosomes. Replicated have a matched pair of chromosomes. Homologous have an unmatched pair. 4) How many pairs of homologous chromosomes are found in the nucleus of a human somatic tissue cell? How many homologous pairs are found in a human gamete? 23 pairs in somatic tissue, and 23 only in the gamete (Krogh, 2009). ...read more.

Conclusion

Gregor Mendel. The metaphase. ( Module 3 Reading). 7) Both crossing over and "Independent Assortment" add genetic variation. How is genetic variation important to natural selection and adaptation? Because if there wasn't independent assortment everyone would be the same! Meiosis II Questions for Meiosis II: 1) Briefly describe what happens in each phase of Meiosis II. Prophase: Strands of DNA form replicated chromosomes. They migrate to the poles while the nuclear envelope disappears. Metaphase Cell lines up along the equator and spindles appear and attach to the chromosomes. Anaphase Spindle fiber pulls the chromosomes apart and they migrate to the poles of the cell. Telophase: The cell divides and the chromosomes uncoil while the nuclear envelope reforms (Module 3 Reading). 2) In a female, the products of meiosis are referred to as ___eggs_________. In a male these cells are referred to as __sperm___________. 3) What is it called when chromosomes in meiosis fail to separate and travel together as the gametes are formed? Mutations that result in an abnormal number of chromosomes Nondisjunction occurs when chromosome fail to separate during meiosis. ( Krogh, 2009). Name 1 genetic condition caused by the failure of chromosomes to separate in Meiosis. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our University Degree Genetics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related University Degree Genetics essays

  1. Biology - PCR Lab

    ____ 200 ____ 100 ____ ____ ____ ____ ____ ____ ____ Well 1. Two bands seen, one 100 kilo bases in length and the other 400 kilo bases in length, indicating the individual is heterozygous Well 2. One band seen at the 100 kilo bases length, indicating the individual is homozygous negative.

  2. DNA Fingerprinting: A review of the criticisms of DNA evidence. Is it really the ...

    They ruled that there was "a clear objective distinction" between those that had been suspected but at the end were found innocent, and those that were absolutely innocent. However Lord Sedley had different opinion. He was of the view that there was discrimination between the two categories, but that such

  1. The Integration of DNA Applications in Forensic Science

    This innovation allows crime labs to compare and exchange DNA profiles electronically in an effort to link violent, serial offenses (Kirschner, 2002). CODIS also has subordinate State DNA Indexing Systems (SDIS) and Local DNA Indexing Systems (LDIS) for and even more centralization.

  2. Free essay

    Why am i unique

    As in the first part of meiosis, telophase takes place simultaneously to Cytokinesis, an as the cytoplasm begins to split the chromosomes begin to uncoil and the nuclei are formed. The product is four daughter cells all with haploid sets of chromosomes, but each of the cells is genetically different from the parent cell and the other daughter cells.

  1. Using DNA to Solve Crimes.

    Commission to study rapidly evolving advances in all areas of the forensic sciences and to make recommendations to maximize the use of the forensic sciences in the criminal justice system. In all, the President's initiative will devote $24.8 million in FY 2004 to fund advances in the use of DNA technology.

  2. Bloom's Syndrome

    The risk of cancer is greater than normal throughout life. The variety of sites and types that affect the general population. Various types of leukemia develop at an average age of twenty-two. Patients who survive beyond the age of twenty-two develop solid tumors at an average age Parrington 3 of thirty-five.

  1. The Many Controversies of Stem Cell Research.

    human cloning because it would usurp God's role as creator of life. Unfortunately some scientists aren't using discarded embryos. In the Jones Institute for Reproductive Medicine in Norfolk, Virginia, scientists have been taking volunteers' sperm and eggs to create a human embryo only to destroy it for its use to gather stem cells (Krauthammer, 2001).

  2. Darwin and Natural Selection

    However, as Darwin was the first to articulate that populations evolved, not individuals and because of his extensive evidence detailed in On the Origin of Species, it is Darwin who is remembered. (Sadava, D. 2011) In publishing a theory that went against the predominant, religious theory of creationism and

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work