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.