For a particular character,natural selection can favor an average phenotype or extreme phenotypes.In order to do this,a character must be:

Question

Quizplus · Accepted Answer

For natural selection to favor extreme or average phenotypes, the character must be under the control of many genes. Polygenic traits controlled by multiple genes enable a wide range of phenotypic variation that can be subjected to selection. Therefore, option A is the best choice. B, C, and D are incorrect. Option B suggests a single gene with two alleles, which can only produce two phenotypes, whereas natural selection requires many phenotypes. Option C suggests that the character is not genetically controlled, which is unlikely in most cases. Option D suggests a dominant allele, which would not necessarily lead to extreme phenotypes.

For a Particular Character,natural Selection Can Favor an Average Phenotype