Pests have always been a nuisance for farmers. the use of pesticides dramatically improved the success of crops; however, it has been found that some insects are no longer harmed by traditional pesticides. how would charles darwin, the man behind the theory of evolution by means of natural selection, explain this phenomenon.
a) through random mutations in dna, some pests developed a resistance to the pesticide.
b) the chemicals used in pesticides today are not strong enough to kill unwanted pests.
c) the pesticides used in the past caused unwanted mutations in pests causing them to mutate into superbugs.
d) through repeated exposure to the pesticides, the pests simply got use to to the chemicals and built up a resistance.

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).

The frequency of alleles in a population that is in hardy weinberg equilibrium? a . changes in each successive generation b. is less important than the frequency genotypes c. shows evidence of the process of natural selection d. remains the same over several generations

In what cells is the human genome located?