Evolution by natural selection

• What should you be able to describe by the end of the video?

  What's meant by evolution
• How does evolution take place according to the video?

  Through natural selection
• How many different species of animals and plants are there on Earth?

  Nearly 9 million
• What percentage of species that have ever lived on Earth are currently alive?

  One percent
• How long ago did life first develop on Earth?

  More than 3 billion years ago
• What were the first life-forms on Earth described as?

  Very simple, such as single cells
• What is the process called where all species of living things have evolved from simple life forms?

  Evolution by natural selection
• What should you be able to describe by the end of the video?

  What's meant by evolution
• What do rabbits inherit from their parents?

  A combination of alleles
• How does evolution take place according to the video?

  Through natural selection
• What advantage do rabbits with alleles for thicker fur have in a colder environment?

  They are more likely to survive
• How many different species of animals and plants are there on Earth?

  Nearly 9 million
• What percentage of species that have ever lived on Earth are currently alive?

  One percent
• What happens to the alleles for thicker fur over many generations?

  They become more common in the population
• How long ago did life first develop on Earth?

  More than 3 billion years ago
• What advantage do rabbits with better eyesight or hearing have when a predator moves in?

  They can detect the predator sooner
• What were the first life-forms on Earth described as?

  Very simple, like single cells
• What is the process called where all species of living things have evolved from simple life forms?

  Evolution by natural selection
• What is the definition of evolution provided in the video?

  Change in inherited characteristics over time
• What can happen when two populations of one species become so different?

  They can no longer interbreed
• What happens to rabbits with alleles for thicker fur in colder environments?

  They are more likely to survive
• What is the result of rabbits with thicker fur surviving and reproducing?

  Alleles for thicker fur become more common
• What advantage do rabbits with better eyesight or hearing have?

  They can detect predators more easily
• What is the definition of evolution provided in the video?

  Change in inherited characteristics over time
• Why can't pygmy rabbits breed successfully with normal-sized rabbits?

  They are too different in phenotype
• What happens when two populations of one species become so different?

  They can no longer interbreed
• What will be covered in more detail in a later video?

  Speciation
• Why can't pygmy rabbits breed successfully with normal-sized rabbits?

  They are too different in phenotype
• Where can you find questions on evolution by natural selection?

  In the vision world book
• What is the process of natural selection?

  • Genetic variation exists within a population
  • Environmental changes favor certain traits
  • Individuals with advantageous traits survive and reproduce
  • Beneficial traits become more common over generations
• What are the implications of speciation?

  • Two populations can no longer interbreed
  • Leads to the formation of new species
  • Involves significant genetic divergence