Mechanisms of Evolution

The video tutorial explains how genetic variation leads to evolution through mutation, natural selection, and genetic drift. Mutations introduce new gene types, which can be passed to offspring if they occur in sex cells. Natural selection promotes beneficial mutations, as seen in the evolution of polar bears. Genetic drift, on the other hand, changes gene frequency by chance, affecting species evolution without necessarily improving fitness.

What is the primary process through which new gene types arise?

• Mutation

• Genetic drift

• Natural selection

• Gene flow

How does natural selection influence mutations that affect survival?

• It removes beneficial mutations

• It promotes harmful mutations

• It promotes beneficial mutations and removes harmful ones

• It has no effect on mutations

What example is given to illustrate natural selection in the video?

• The evolution of giraffes' long necks

• The evolution of polar bears from brown bears

• The development of antibiotic resistance in bacteria

• The adaptation of finches on the Galapagos Islands

What is genetic drift primarily based on?

• Fitness

• Chance

• Environmental adaptation

• Survival of the fittest

How does genetic drift differ from natural selection?

• Genetic drift and natural selection are the same processes

• Genetic drift only occurs in large populations, while natural selection occurs in small populations

• Genetic drift is random, while natural selection promotes useful adaptations

• Genetic drift is based on fitness, while natural selection is based on chance