Question

The fitness of individuals with different phenotypes of the same trait differs in two different situations P and Q. P and Q respectively indicate

• A. disruptive and directional selection
• B. directional and stabilising selection
• C. directional and disruptive selection
• D. stabilising and disruptive selection.

Answer 1

Answer: (A)

disruptive and directional selection

Darwin stated that of fitness of an organism is measured by its ability to survive better than other species in a given surrounding.

Disruptive selection is a type of natural selection which can describe the change in population gene pool where the two extreme values of the population are favoured over the middle values. Here, the population is divided into two distinct groups.

Directional selection is a type of natural selection of species in which the extreme phenotype is preferred over the other phenotype and after a large amount of time the entire frequency of allele shift in that direction.

So, the correct option is 'disruptive and directional selection'