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the graph below is of directional selection. which statement can be supported by the evidence shown in the

a. directional selection occurs when phenotypes at both extremes of the phenotypic distribution are selected against.

b. directional selection occurs when one of two extreme phenotypes is selected against.

c. directional selection occurs when one of two extreme phenotypes is selected for.

d. directional selection occurs when phenotypes in the middle of the range are selected against.

Answer: C) Directional selection occurs when one of two extreme phenotypes is selected for.

The type of natural selection known as directional selection is defined in population genetics in the case in which an extreme phenotype is favored over other phenotype. Thus, the population and its allele frequency will evolve towards this end of the trait spectrum (extreme phenotype). This is also the case illustrated in the graph where the right side represents the extreme phenotype.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.