Scenario #1: suppose there is a population of rabbits. the color of the rabbits is governed by two
incompletely dominant traits: black fur represented by “b” and white fur represented by “b”. a rabbit
with the genotype of “bb” would have a phenotype of black fur, a genotype of “bb” would have gray
fur (a display of both black and white) and a genotype of “bb” would have a phenotype of white fur.
what type of selection would occur if this population migrated to an area that had very dark rocks as
well as white colored stone?

The question lacks options but the appropriate answer is DISRUPTIVE SELECTION.

Explanation:

Disruptive selection, also called diversifying selection is one of the three types of natural selection that occurs when the extreme values of a trait are environmentally favored over the intermediate value. Over time the two extreme values of a particular trait becomes more rampant while the intermediate value gradually diminishes.

In this question regarding fur colour of rabbits. The alleles of fur colour (black, B and white, b) exhibits incomplete dominance to form an intermediate phenotype (gray). Hence, the extreme values of the fur colour trait in rabbits are the black and white phenotypes while the intermediate value is the Gray phenotype (showing black and white coloration).

When a population of rabbits that possess these three phenotypes migrate to an area that has very dark rocks as well as white colored stone, natural selection will favor the extreme phenotypes (black and white coloration) because they will be better adapted to the background color of that area i.e. black furrred rabbits will be able to camouflage perfectly in the parts with dark rocks while white furred rabbits will camouflage well in the parts with white stones allowing them escape predation.

However, the intermediate phenotype with both white and black colors (gray) will be easily spotted by predators in both parts of the area, hence, will be preyed upon. At the end, the black and white phenotypes of rabbits (extreme values) will be more common while the gray rabbits (intermediate) will gradually decline and get lost completely. This type of selection in which the two extreme values (black and white) are favored and the intermediate value is at a disadvantage is called DISRUPTIVE SELECTION.

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