Fruit flies with one allele for curly wings (cm and one allele for normal wings (cy+) have curly wings. when two curly- winged flies were crossed, 203 curly-winged and 98 normal-winged flies were obtained. in fact, all crosses between curly- winged flies produce nearly the same curly : normal ratio among the progeny. a. whet is the approximate phenotypic ratio in these offspring? b. suggest an explanation for these date. c. if a curly-winged fly was mated to e normal- winged fly. how many flies of each type would you expect among 180 total offspring?

"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."

which fault and or fold did you find most difficult to diagram