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

Two true-breeding pea plants were crossed. one parent is round, terminal, violet, constricted, while the other expresses the respective contrasting phenotypes of wrinkled, axial, white, full. the four pairs of contrasting traits are controlled by four genes, each located on a separate chromosome. in the f1 only round, axial, violet, and full were expressed. in the f2, all possible combinations of these traits were expressed in ratios consistent with mendelian inheritance. (a) what conclusion about the inheritance of the traits can be drawn based on the f1 results? (b) in the f2 results, which phenotype appeared most frequently? what mathematical expression predicts the probability of occurrence of this phenotype? (c) which f2 phenotype is expected to occur least frequently? what mathematical expression predicts this probability? (d) in the f2 generation, how often is either of the p1 phenotypes likely to occur? express your answer as a fraction (example: 3/16).

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review

The two main stages of cell division are called