Posted by ourania on Tuesday, December 16, 2008 at 12:18pm.
I agree with both of your answers.
C is possibly the first answer, it would depend on that the Dr is studying. Lagged cross-coorelation coefficents look for delayed reactions in one twin due to a change in the other. Two years is a hint, but not conclusive.
B is correct on the second.
D is definitely the correct answer for the first question. The case study method follows individuals for a prolonged period of time — a longitudinal study. Two years would qualify as a long period of time.
You are right with the second question. Down syndrome is caused by a trisomy (an extra chromosome) of chromosome 21.
I hope this helps a little more. Thanks for asking.
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