Contrary to the popularly wide held belief that evolutionary change is a slow, continual process, selection has the ability to produce evolutionary change relatively quickly. The first exemplary observation of this comes from Grant’s observation. The Grant’s observation involved medium ground finches and large ground finches that inhabited the Galapagos Islands. The study concentrated on the species’ beaks form and weight.
The individuals found that the environment surrounding the Galapagos Islands contributed greatly to the evolution of medium ground finches. The environment shifted so much so that in a matter of 30 to 46 years the medium ground finches had soon evolved to mirror their relatives, the large ground finches. These statistics indicate that the beak size increased around four percent during the 1977 drought. In addition, a group of elk in the eastern part of the world near France underwent a significantly dramatic evolution in a short amount of time. The elk’s evolution was prompted by rising sea levels that left the population abandoned. The evolutionary changes were seen almost 6,000 years later when the pieces of land reconnected, and what was discovered was the the elk had transformed from these large husky animals into the size of a mere large dog. Another key examples of evolutionary change that occurs relatively quick is the everyday household dog. It’s a widely held belief that dogs are descendants of wolves, but scientists can guess that about 15,000 years ago the selection happened in a few thousand generations as a result of breeding, environment changes, and so on.
Furthermore, rapid evolutionary change can be viewed in a species of fish, specifically small minnows, called Poeciliopsis. The species provides evolutionary differences in the formation of their young. For the majority of Peociliopsis, the eggs are provided nutrients via the female before fertilization. These young are typically smaller than the egg that they inhabited after they are born. On the contrary, another breed of the same species still receive nutrients from the females while they are developing and, as a result, can end up being 100 times the weight of their egg when they are fertilized.
This change occurs primarily because of the differentiation between the type of tissues the latter breed uses that closely resembles that of a placenta in a mammal. Scientists suggest this change occurred less than 2.4 million years ago. In continuation, scientists discovered the fast revolutionary change of an eye in aquatic organisms by using a model of the eye itself. These scientists discovered that after a change of one percent that occurred 538 times that the changes resulted in a simple concave eye cup. The results continue to change as a elliptical lens is produced, as well as a end result of a spherical gradient lens as opposed to the origin of a light-sensitive tissue on a flat spot that is located between a transparent protective layer and a dark pigment. All of these organisms have gone through a relatively quick evolutionary change, and have resulted in a variety of new organisms and breeds of species that we know of today. In essence, just because a change doesn’t occur within a year does not mean that the evolution is “slow” compared to the fossil record of other organisms who have undergone evolution as well.