First, please listen to this NPR story (about 8 minutes) about one womans defense that her children were indeed her own even though initial DNA testing showed that she was not their biological mother. http://www.npr.org/templates/story/story.php?storyId=1392149 Here is an article on a second, similar case. Note that I usually do not support use of Wikipedia for science knowledge as anyone can alter this information in any way that they wish to; however, for these types of stories that are just science-related interesting facts, this is okay. Here is the link to this: http://en.wikipedia.org/wiki/Lydia_Fairchild After you listen to the above story, please make a post to this discussion board answering one or more of the following questions: 1. Where in a eukaryotic cell is DNA found? (hint: two locations, NOT one). Do these two types of DNA differ in the way that they are passed down maternal inheritance, paternal inheritance, both; why? 2. Are both of these types of DNA specific or unique to an individual? 3. What is chimerism? Can humans be chimeric, how and why in terms of biology how does this occur naturally (here I am looking for a general naturally occurring phenomena to explain this; hint: the NPR audio answers this. Here, I am NOT looking for explanations of how animal chimeras are created in labs)? 4. How do you think chimerism affects crime investigation? Can a chimeric suspect be erroneously released based on DNA testing, even though he/she actually committed the crime, why? 5. Do you think that standard DNA testing, either as part of a criminal investigation or a parental custody case, should include testing for chimerism? Why, or why not?
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