Tuesday, April 27, 2010

Topic 1, Assignment #2 : Genetics in the News

Assignment 2: Current Events - Genetics in the News

For this current events assignment, you will need to identify and summarize a news story that relates to a topic in genetics. You might look for a news story that describes a topic that we have already discussed, or it might relate to topics that will come up later in the course (see the syllabus). The specific focus is up to you as long as it connects in some way to genetics.

Assignment Guidelines:
• Use an online news search engine to identify current stories related to a topic in genetics (posted within the last 18 months).

Feel free to use any news site, but some suggestions include:
• http://discovermagazine.com/
• http://www.newscientist.com/home.ns
• http://www.sciam.com/search/
• http://www.sciencenews.org/pages/search.asp
• http://www.sciencedaily.com/search/
• http://www.nytimes.com/pages/science/
• http://news.google.com

• Using the news site's search tool, enter in one or more key words. Examples of key words include: genetics, DNA, gene, chromosome, genome, and mitosis. Other possibilities include stem cells, cloning, cancer, polymerase chain reaction, genetically modified organisms, etc. Feel free to be creative in choosing key words; you might be surprised to find what is making the news!

• Choose a news story that most interests you, and summarize one or more key points of this article in your own words. The length of your summary should be between one to three paragraphs. Include the web link to the original news article in your written summary.

Bring your summary to class to share with your peers.

Sunday, April 25, 2010

Topic 1: Single Gene

During this session, we will focus on exploring genes and inheritance patterns.

We will use a virtual lab program to experiment with Drosophila genetics.

Activities and Assignments

Assignment 1: Having "Pun" with Punnett Squares.

Punnett Squares can be used to predict the probability of producing offspring with specific genotypes/ phenotypes. For this assignment, we will use Punnett Squares to make predictions about the inheritance pattern of the genetic disorder sickle cell anemia.

To begin, complete the following activities:
Read:
Text pages 351-355.


Sites to visit:

Punnett Square tutorial 1:
http://www.biology.arizona.edu/mendelian_genetics/problem_sets/monohybrid_cross/01t.html


Punnett Square tutorial 2:
http://www2.edc.org/weblabs/Punnett/punnettsquares.html


Monohybrid Cross and Punnett Squares
http://wps.prenhall.com/esm_klug_essentials_5/0,8785,1170646-content,00.html <---Take post-quiz: 3.1 Monohybrid Cross and Punnett Squares and write down your answers. You will turn this in to Ms. Johnson.


Discussion

Sickle cell anemia (SCA) is a human genetic disorder caused by a recessive allele (so "normal" would be dominant). A couple wants to know the probability that they will have a child affected by SCA.

For each scenario, what are the chances that this couple will have a child with sickle cell anemia? Create a punnett square for each scenario and bring your results to class.

1) Both the man and woman are normal, but each has one affected parent and one normal parent with no family history of SCA.

2) The man is affected by SCA; the normal woman has no family history of SCA.

3) Both the man and woman are affected by SCA.


TO BE TURNED IN ON TUESDAY, APRIL 27th
-Answers to "Post Quiz 3.1"
-Answers to sickle cell scenarios 1, 2, and 3