Which of the following changes is least likely to produce a phenotypic change in an organism and why?

A. UAG to UAC because a change in the last amino acid of a codon, produces very little change.

B. UGA to UAA because both code for a stop codon therefore there is no effect on the protein produced.

C. AUG to AUA because as long as the first to amino acids are the same, there is little effect on the protein produced.

D. GAU to GGU because a change in the second amino acid of a codon does not have much effect on the protein produced

Agenetically engineered corn plant is approved for agricultural use. the plant produces pollen that can make its own toxins. these toxins protect the corn plant against pests and no longer require the application of chemical pesticide. what is a likely impact on the farmer of growing such a variety of corn? a- the financial costs for the farmer would be lowered since less crops would be lost to pests. b-the financial costs for the farmer would be lowered since more crops would be lost to pests. c-the farmer may be held responsible for increasing chemical pollution. d-the farmer's expenses for pest control would increase due to an increase in bee population.