When the mean value of variation is selected against, selection results.

disruptive
directional
stabilizing
no

Stabilizing selection.

Explanation:

Stabilizing selection may be defined as the type of natural selection in which the mean population stabilizes for a particular trait. The theory of stabilising selection was given by Ivan Schmalhausen.

Stabilizing selection doesnot select against the extreme phenotype but the mean variant is selected in the population. This selection shows the negative selection in a population.

Thus, the correct answer is option (3).

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.