Natural Selection and Evolution: Unraveling Biological Mechanisms and Evidence

Mr. Andersen reviews key concepts of evolution and natural selection, explaining how changes in allele frequency within a population lead to evolution. He discusses the population genetics lab, examples of natural selection, genetic drift, and evidence for evolution. The video also covers the camouflage lab and the concept of common ancestry, emphasizing the shared genetic material across all life forms.

What is the smallest unit in biology that can evolve?

• A gene

• An individual organism

• A species

• A population

What is the primary mechanism by which evolution leads to better adaptation to the environment?

• Genetic drift

• Gene flow

• Mutation

• Natural selection

In the population genetics lab, what condition must be met for allele frequencies to remain constant?

• Non-random mating

• No natural selection

• High mutation rate

• Small population size

What is an example of heterozygote advantage discussed in the video?

• Sickle-cell anemia

• Peppered moth coloration

• Antibiotic resistance

• Flowering time in plants

How does global warming affect the flowering time of plants?

• Plants flower later in the year

• Plants flower at random times

• Plants flower earlier in the year

• Plants stop flowering

What is genetic drift primarily associated with?

• Chance events

• Large population size

• Gene flow

• Natural selection

Which of the following is an example of evidence for evolution?

• Antibiotic resistance

• Random mating

• Gene flow

• Large population size

What does the presence of homologous structures in different species suggest?

• Environmental adaptation

• Common ancestry

• Random mutation

• Independent evolution

What is the central dogma of molecular biology?

• RNA to DNA to Protein

• DNA to Protein to RNA

• DNA to RNA to Protein

• Protein to RNA to DNA

What is a conserved process across all life forms that indicates common ancestry?

• Protein synthesis

• Photosynthesis

• Glycolysis

• Cell division