Variation and evolution

Cards (26)

  • What can lead to huge variation between individuals?
    Differences in genes and environment
  • What is the process called that can lead to the evolution of new species?
    Natural selection
  • What term describes the differences among individuals in a population?
    Variation
  • What does a phenotype describe?
    Observable characteristics of an individual
  • What two factors interact to determine a phenotype?
    Genes and environment
  • What do genes code for?
    Proteins
  • What is a genome?
    All of your genes combined
  • Why does everyone have a unique genome?
    Different combinations of proteins
  • How can identical twins differ in height?
    Due to differences in environment
  • What can affect the skin color of identical twins?
    Sun exposure
  • What influences most of our traits?
    Interaction of genes and environmental factors
  • What causes genetic variation?
    Mutations
  • What is a mutation?
    A change in the DNA code
  • What is the effect of most mutations on phenotypes?
    They have no effect
  • What can beneficial mutations do?
    Enhance survival and reproduction
  • Who proposed the idea of survival of the fittest?
    Charles Darwin
  • What did Darwin observe about traits in populations?
    Useful traits were passed on more
  • What does natural selection describe?
    Fittest individuals are selected to survive
  • What does evolution describe?
    Inheritance of characteristics over generations
  • From what do all current species evolve?
    Different species in the past
  • What does the theory of evolution imply about all living species?
    They evolved from simple life forms
  • What evidence supports Darwin's theory of evolution?
    Antibiotic resistance and fossil records
  • What is the summary of evolution through natural selection?
    • Evolution occurs through natural selection
    • Genetic changes lead to advantageous phenotypes
    • Over time, populations may diverge
    • New species can form when interbreeding ceases
  • What happens when two populations can no longer interbreed?
    A new species has formed
  • What is the time frame for evolution to occur?
    Given enough time
  • What should you do if you enjoyed the video?
    Like and subscribe