The process of Natural selection is based on the following four postulates:
Postulate 1 - Individual members of a population differ from one another in many respects.
Postulate 2 - At least some of the differences among members of a population are due to characteristics that may be passed from parent to offspring. That is, they are heritable or genetic.
Postulate 3 - In each generation, some individuals in a population survive and reproduce successfully but others do not.
Postulate 4 - The fate of individuals is not determined by luck. Instead, an individual's likelihood of survival and reproduction depends on its characteristics. Individuals with advantageous traits survive longest and leave the most offspring, a process known as Natural Selection.
Choose ONE animal species. Describe the way in which an evolutionary change might occur for a particular characteristic (trait) of that species as a result of natural selection. The characteristic could be something like coloration pattern, length of the limbs, or size of the teeth or beak, or any measurable trait that is inherited.
The organism you choose should be a real one but the evolutionary change you describe can be real or theoretical.
In your own words,
a. Explain how the change in this trait occurs in terms of the four postulates listed above and in the book. You will describe what the population starts out like at time zero and then what it will look like at a later time, as a result of natural selection.
b. Explain the process by which the changes occurred. What is the selective pressure? Explain why the change might confer more fitness to a particular environment?
Tips: Make sure to include the following in your answers to a and b above:
Clearly state the name of the SPECIES you are going to be talking about for this assignment. (Make sure you know what is meant by a species.)
Also, clearly state what population of the species you are going to talk about by specifying its geographic location. (Make sure you understand what a "population" is.)
Clearly state the characteristic (trait) of the population that you are going to be talking about and explain how this trait varies among individuals.
Explain what change occurs in the environment that causes a change in the above characteristic (trait)?