Maria is concerned because she has been exposed to a small amount of radiation during an x-ray. what is h
likely to tell her?
radiation from x-rays is not a mutagen unless you have x-rays every day.
mutagens have no effect on the body unless you have inherited them.
small amounts of a mutagen often do not have an effect on health.
severe mutations are usually caused by small amounts of a mutagen.

b. heterotroph

explanation:

"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."

you know they are heterozygous for a trait because they have it as jj or jj.