OBJECTIVE LIFE SCIENCE
EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Directional selection
|
|
|
Disruptive selection
|
|
|
Stabilizing selection
|
|
|
Sexual Selection
|
Detailed explanation-1: -In a finch population, if finches having large beaks and finches having small beaks increase in numbers while finches with average beaks decreases is directional selection.
Detailed explanation-2: -Due to forces of disruptive selection, intermediate beak sizes have been selected against for generations. The resulting population has almost no medium sized beaks. Beak size is important for more than just gathering food, and it has been found that beak size also changes the mating calls of the various finches.
Detailed explanation-3: -The year following the drought when the Grants measured beak sizes in the much-reduced population, they found that the average bill size was larger. This was clear evidence for natural selection of bill size caused by the availability of seeds.