After thinking about these results for a while, you realize based on your previous work that there are actually different mechanisms for a canary to end up with yellow plumage. Either the canary is homozygous recessive for gene A, in which case it is not capable to produce any darker pigment, or it can produce the pigment, but it is homozygous recessive for gene B, and hence the resulting pigment is never inserted (expressed) in the developing feathers. For each of the 5 possible outcomes resulting from a cross of a yellow F2 canary with a pied F1 canary, identify which mechanism was responsible for the plumage color in your yellow F2 parent that you used in the cross.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

the supermassive black hole is in the middle of the galaxy.

"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."