AP BIOLOGY

Detailed explanation-1: -Variations are the basic pre-requisite and progressive factor for evolution because without variations no change could occur in individuals and evolution would be impossible.

Detailed explanation-2: -Not all variants influence evolution. Only hereditary variants, which occur in egg or sperm cells, can be passed to future generations and potentially contribute to evolution. Some variants occur during a person’s lifetime in only some of the body’s cells and are not hereditary, so natural selection cannot play a role.

Detailed explanation-3: -Evolution and Adaptation to the Environment Variation allows some individuals within a population to adapt to the changing environment. Because natural selection acts directly only on phenotypes, more genetic variation within a population usually enables more phenotypic variation.

Detailed explanation-4: -There is a high risk of extinction if genetic variation does not occur. Evolution cannot occur in the absence of genetic variation because they give natural selection, helps organisms evolve and help them get habitat to every environmental condition.

Detailed explanation-5: -Evolution cannot occur without genetic changes in population. This statement is TRUE. The theory of Natural Selection was proposed by Charles Darwin to explain evolution.