Evolution

• Darwin's Theory of Evolution


  Darwin's concept of natural selection was based on several key observations
• Key observations of Darwin's Theory of Evolution

  • Traits are often heritable
  • More offspring are produced than can survive
  • Offspring vary in their heritable traits
• Darwin's Theory of Evolution

  1. Individuals with inherited traits that help them survive and reproduce will leave more offspring in the next generation

  2. Helpful traits are heritable, and organisms with these traits leave more offspring

  3. Over generations, the population will become adapted to its environment as individuals with traits helpful in that environment have consistently greater reproductive success
• Darwin knew traits were inherited, even though he did not know that traits were inherited via genes
• Organisms are capable of producing more offspring than their environments can support, leading to competition for limited resources in each generation
• The offspring in any generation will be slightly different from one another in their traits (color, size, shape, etc.), and many of these features will be heritable
• Echolocation


  A technique used by bats, dolphins and other animals to determine the location of objects using reflected sound
• Echolocation allows animals to move around in pitch darkness
• Echolocation


  • Navigate
  • Hunt
  • Identify friends and enemies
  • Avoid obstacles
• All the information present in a cell, an organism possesses to survive is known as genetic information
• Genetic information stores, processes and transmits biological data from generation to generation
• Darwin's Theory of Evolution


  Darwin's concept of natural selection was based on several key observations
• Key observations of Darwin's Theory of Evolution

  • Traits are often heritable
  • More offspring are produced than can survive
  • Offspring vary in their heritable traits
• Darwin's Theory of Evolution

  1. Individuals with inherited traits that help them survive and reproduce will leave more offspring in the next generation

  2. Helpful traits are heritable, and organisms with these traits leave more offspring

  3. Over generations, the population will become adapted to its environment as individuals with traits helpful in that environment have consistently greater reproductive success
• Darwin knew traits were inherited, even though he did not know that traits were inherited via genes
• Organisms are capable of producing more offspring than their environments can support, leading to competition for limited resources in each generation
• The offspring in any generation will be slightly different from one another in their traits (color, size, shape, etc.), and many of these features will be heritable
• Echolocation


  A technique used by bats, dolphins and other animals to determine the location of objects using reflected sound
• Echolocation allows animals to move around in pitch darkness
• Echolocation


  • Navigate
  • Hunt
  • Identify friends and enemies
  • Avoid obstacles
• All the information present in a cell, an organism possesses to survive is known as genetic information
• Genetic information stores, processes and transmits biological data from generation to generation