In which situation is one likely to discover situs inversus? when performing an x-ray on a young child for the first time
while performing an electrocardiogram
when doing a sleep study
while fitting a prosthetic

X-ray

Explanation:

X-rays show an outline of the heart;

Situs inversus is when the organs are all on the opposite side of the body compared to normal;

The heart, therefore, will be found on the right than the left;

This would be visible on an x-ray

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."