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

    discrimination was objectively justified, provided that data would have been destroyed in cases in which investigation shouldn't be initiated in the first place49. It seems that discrimination would be no issue once the day comes, when every member of a population has been sampled on a DNA database; Sir Alec

  1. Biology - PCR Lab

    Pour the sample solution from the paper cup back into the tube that contained the saline solution and close cap tightly. 5. Spin sample in preparatory centrifuge on high speed for 10 minutes. 6. Carefully pour off supernatant (liquid on top)

  2. Bloom's Syndrome

    Bloom's syndrome is usually associated with dwarfism. Diabetes occurs in approximately ten percent of individuals with Bloom's Syndrome. Intelligence is usually normal, although mild mental deficiency has occurred in a few affected persons. Men with Bloom's Syndrome are usually infertile, and fertility appears to be reduced in women affected with Bloom's Syndrome.

  1. Discuss the biology of muscular dystrophy

    So, lane 2 represents a patient with DMD; lane 4 represents BMD; and lane 6 represents severe BMD (low abundance of dystrophin). Patterns in lanes 1, 3, 5, and 7 are from normal controls .Comparison with levels of myosin (below)

  2. Genetics Report on Laboratory Grown Sperm

    should have a say on this matter as Science is the truth of all that we know" (dailymail.co.uk/health). According to Dr Allen Pacey, designer babies with desirable attributes may become, "The most important social harm likely to result from non-regulation of genetic testing is the facilitation and encouragement of free-market

  1. The Molecules and Macromolecules of the Cell.

    The third stage determines the overall shape of a polypeptide, but this stage is very similar to the second, and indeed these stages could be classed as the same actions. The final stage only happens when more than one polypeptide is to form the finished protein.

  2. Darwin and Natural Selection

    to occur, the genotype (the genetic background) must first be changed and this occurs through random genetic or chromosomal mutations or through recombination. Most random mutations are not functional and those that are tend to be harmful, such as the chromosomal mutation that causes Downâs syndrome, or Trisomy 21, through the addition of an extra copy of chromosome 21.

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