Biology 1407- Lecture Exam 1 with Complete Solutions

Biology 1407- Lecture Exam 1 with Complete Solutions What is the definition of Evolution? - Correct Answer Change in the genetic composition of a population over time What is a population? - Correct Answer Number of organisms of the same species that live in a particular geographic area at the same time. Why do we only consider evolution with regard to populations and not individuals? - Correct Answer Individual organisms retain the same genes throughout their life. Therefore, individuals do not evolve, populations do. What kinds of direct observations have provided key evidence for evolution? - Correct Answer Gradualism, uniformitarianism, most animals are endemic, & organisms differed between islands. Gradualism - Correct Answer slow continual forces that caused change long ago and are still at work. slow & constant. Uniformatarianism - Correct Answer natural laws of universe are constant over time. Present, same as past. Who is generally credited with the primary mechanism by which evolution arises? - Correct Answer Charles Darwin and Alfred Russell Wallace, in the 19th century. What is meant by descent with modification? - Correct Answer It is the idea that species change over time, gives rise to new species and share a common ancestor. What is the mechanism that is primarily responsible for evolutionary change? - Correct Answer Natural selection genetic drift gene flow mutation