• 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...


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.


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.


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

    Run the gel for 1 hour at 80 Volts constant voltage. 11. Stain, destain and photograph the gel as usual. 12. Analyze the DNA fragments on the gel. Data Collection: The following two charts depict the final result of gel electrophoresis, and the data indicates whether the person tested

  2. Bloom's Syndrome

    These tumors are fortunately sensitive to chemotherapy and radiotherapy. With an increase in age, resistance to infections gradually improves and so does the skins' photosensitivity. Cause of the Disease The syndrome is caused by mutation in the gene designated BLM which has been traced to chromosome 15q26.1.

  1. Free essay

    Why am i unique

    With this happening in both male and female gametes, it means that anyone of the 8 million maternal gametes could be fertilized by any one of the 8 million paternal gametes. This means that a resulting zygote could have more than 64 trillion diploid combinations.

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

    that person is in police detention following his arrest for a recordable offence. 2.2 The Retention of DNA and Civil Liberties In the case of Marper42 both applicants have been arrested and charged for different offences and DNA samples were taken from them.

  1. The Integration of DNA Applications in Forensic Science

    Running blanks, checking standards on the equipment routinely and monitoring expiration dates of reagents are a few guidelines that should be in every laboratory protocol. The final contributor to error in the laboratory is evidence contamination that results in test failures or unusual spikes.

  2. The Ethics of Human Cloning.

    This may be taken to the extreme however in a cloned child, where their appearance, manner and intelligence can to some extent be predicted and consciously or unconsciously compared to that of the original, which may constantly overshadow it. This scenario could be compared to somebody buying a new car,

  1. Using DNA to Solve Crimes.

    searches of the database by participating forensic laboratories. The initiative calls for $9.9 million in FY 2004 to fund this program. 3. Stimulating Research and Development Top In order to improve the use of DNA technology to advance the cause of justice, the Attorney General will stimulate research and development of new methods of analysing DNA samples under the President's initiative.

  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