Examples of Natural Selection

Mr. Anderson discusses natural selection and evolution, focusing on real-world examples. He explains how climate change affects species, using Glacier National Park and Thoreau's observations as examples. The video covers mutations and their impact on phenotypes, highlighting sickle cell anemia and its evolutionary implications. Finally, it addresses human-induced changes, such as antibiotic-resistant bacteria, emphasizing the importance of responsible antibiotic use.

What is the primary cause of the melting glaciers in Glacier National Park?

• Increased snowfall

• Earth's warming climate

• Decreased sunlight

• Volcanic activity

How does natural selection differ from random events in causing evolution?

• It leads to less diversity

• It results in organisms better adapted to their environment

• It has no impact on organisms

• It creates organisms less suited to their environment

What is the relationship between sickle cell anemia and malaria?

• Sickle cell anemia increases malaria risk

• There is no relationship

• Sickle cell anemia provides resistance to malaria

• Malaria causes sickle cell anemia

What is a phenotype?

• A type of natural selection

• A genetic disorder

• A physical characteristic of an organism

• A type of DNA mutation

What is the main concern with antibiotic-resistant bacteria?

• They are easier to treat

• They are less harmful

• They are resistant to multiple antibiotics

• They do not affect humans

How can humans contribute to the development of antibiotic-resistant bacteria?

• By using antibiotics for viral infections

• By avoiding antibiotics altogether

• By not completing antibiotic courses

• By using antibiotics only when necessary

What is the role of natural selection in the development of antibiotic-resistant bacteria?

• It eliminates all bacteria

• It selects for bacteria that are not resistant

• It has no role

• It selects for bacteria that are resistant