Posted in P6 SBI3U Biology

SBI3U Gametogenesis and Conception Assignment – NOW DUE THURSDAY APRIL 9

Instructions – Complete the spermatogenesis, oogenesis and conception handouts using the following instructions.

The analysis questions are to be submitted on the VLE under the Assessment –> Assignments section by the beginning of class on March 24.

Gametogenesis & Conception Data

  1. Use two different colours for the chromosomes from dad’s parents and complete the spermatogenesis diagram. For example, dark blue for the chromosomes from dad’s dad, light blue for the chromosomes from dad’s mom.
  2. Use two new colours for the chromosomes from mom’s parents.  For example, red for the chromosomes from mom’s dad and pink for the chromosomes from mom’s mom.
  3. Make sure each chromatid has a least one cross-over.
  4. Make sure that the cross-overs for spermatogenesis are different than oogenesis.
  5. Randomly choose one of the four sperm that were generated to create the zygote on the conception sheet.  Draw the chromosomes as they would be right after the sperm and egg meet.
  6. Below every cell in all of your diagrams identify it as diploid or haploid.
  7. Within every cell in all of your diagrams, identify the form the chromosomes are in.

Analysis

  1. Whose DNA did the zygote get most of from:
    a) mom (i.e. mom’s mom or mom’s dad)? b) dad (i.e. dad’s mom or dad’s dad)?  Justify your answer based on (means refer to) the chromosomes within the zygote.
  2. Based on your drawings and knowledge from class, what is the overall purpose of meiosis I? (i.e. refer to your drawings and knowledge in your answer)
  3. Based on your drawings and knowledge from class, what is the overall purpose of meiosis II? (i.e. refer to your drawings and knowledge in your answer).
  4. In terms of chromosome distribution (independent assortment), we tossed coins to figure out where chromosomes would go. How many total coin tosses would there be in meiosis of a human cell?  Explain how you arrived at this number.
  5. Explain how it is impossible (other than for identical twins) for one zygote to be genetically identical to another.  Use the data from your charts to explain this.  (No citation needed).
  6. i) Where and when does meiosis happen in a) human males?  b) human females?
    ii) Why is the number of gametes that come from a single primary oocyte different than the number of gametes that come from a single primary spermatocyte?


Application

  1. Other than disease protection, why does meiosis and sexual reproduction give a species an advantage over asexual reproduction?   Give an example to back up your answer.
  2. Using text and diagrams, explain how non-disjunction can happen and identify and describe a condition that non-disjunction can lead to.
    Use your textbook for this one – but you will have to cite it along with your other valid sources.
  3. What does the Catholic Church teach about the value of the zygote?  How does this teaching relate to the use of human embryonic stem cells?  What is a source of stem cells that could be used that would be acceptable to our religion?  (Note:  you will need to refer to the Catechism of the Catholic Church or the YOUCAT and other valid sources to answer these questions.)

Cite your sources using the same method we did for the Cheek Cell Investigation.

If you do not cite your sources, or you copy off of someone else’s wording, this constitutes plagiarism.  A mark of zero will be assigned as a result.

Wikis and discussion groups like Yahoo answers are NOT valid sources of information.  It is vital that you cite valid sources.