Natural Selection and Evolution Concepts

The video explores genetic variation and natural selection, explaining how these processes enable species to adapt to environmental changes. It provides examples of natural selection in various species, including Tasmanian devils, antelopes, and tigers. The video also discusses mutation's role in survival and reproduction, highlighting antibiotic and pesticide resistance in bacteria and insects. Finally, it illustrates natural selection in beetles and frogs, emphasizing the importance of genetic variation in adaptation.

What is the primary role of genetic variation in natural selection?

• To increase the lifespan of organisms

• To create new species

• To allow populations to adapt to environmental changes

• To eliminate weaker individuals

Why do not all offspring survive to adulthood in the natural world?

• Because they are all eaten by predators

• Because the environment cannot support them all

• Because they do not want to grow up

• Because they choose not to reproduce

What is a significant threat to the Tasmanian devil population?

• Infectious facial cancer

• Climate change

• Habitat destruction

• Lack of food

How do bacteria develop resistance to antibiotics?

• By trying hard to resist

• Through random mutations

• By becoming stronger

• By avoiding antibiotics

What happens to a population when a mutation provides resistance to a pesticide?

• The pesticide becomes more effective

• The resistant individuals reproduce more

• The resistant individuals die off

• The population becomes extinct

Why do brown beetles become more common in a population over time?

• They have a genetic advantage over green beetles

• They are more attractive to predators

• They are less visible to predators

• They reproduce less than green beetles

What would happen if a new predator preferred brown beetles over green ones?

• Brown beetles would become more common

• The predator would switch preferences

• Green beetles would become more common

• Both beetles would go extinct

What determines whether a frog population can adapt to a change in forest environment?

• The amount of food available

• The presence of the green allele in the population

• The frogs' ability to change color

• The frogs' desire to survive

What is the definition of evolution in terms of allele frequency?

• A change in the number of species

• A change in the environment

• A change in allele frequency

• A change in the lifespan of organisms

What could lead to the extinction of a frog population under predation pressure?

• Lack of food

• Absence of the green allele

• Too much competition

• Too many predators