Aspecies of fish known as astyanax mexicanus lives in deep underground caves off the coast of mexico. it is virtually blind. the same fish lives near the surface and has fully functioning eyes. over time, what will most likely happen to the sighted and blind types of astyanax mexicanus? one type will become extinct. they will become separate species. they will interbreed and exhibit only the dominant trait. one type will mutate to become more like the other.

the correct answer should be false

{apex}

"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."