1-2 Themes in Biology
1-2 Themes in Biology
Diversity & Unity of Life
• Diversity: There’s lots of different living things.
• Unity: All these different living things have certain things in common– A genetic code– These relationships can be shown with a “tree
of life” model.
Three Domains
• 3 Categories of all living things– Bacteria, Archae, & Eukarya
• Another way to categorize living things is the “Kingdom” system– 6 Kingdoms– Animalia, Plantae, Fungi, Protista, Bacteria,
Archaea
Interdependance
• Organisms & their environment interact
• Ecology studies this
• Ecosystems are communities of living things and their environments
• Humans really interact with the environment
Evolution of Life
• You will change during your life
• All of humanity will change over several generations
• This explains the branches of the tree of life
Natural Selection
• Some organisms have certain favorable traits that make them better able to survive and have more kids that survive.
• Over time there will be more of these kids and the population will start to look different.
• Differential Reproductive Success
1. Name 3 Unifying themes of biology
• How is the unity and diversity in the living world represented as a model?
• I.D. the 3 domains
• How are organisms interdependant?
• Describe why evolution is important in explaining the diversity of life?
• What is the difference between evolution and natural selection?
• Fossil evidence shows that bats descended from shrewlike organisms that could not fly. Write a hypothesis for how natural selection might have led to flying bats.