Question | Answer |
What is evolution? | Scientific theory explains how living things descended from earlier organisms
* change over time
* takes million of years
*helps to understand “life on earth” |
What evidence supports evolution? | Fossils
DNA similar protein
Similar body structures
Early embryonic development |
What is an analogous structure? | a structure in an organism that serves the same function in different species but they evolved independently |
What is an homologous? | Characteristics that are shared by related species because they were from a common ancestor |
What is a naturalist? | a person that observes and studies natural world |
What are the four parts of Darwin's theory? | fossils
diversity
Galapagos Organisms
Darwin's hypothesis |
What is adaptation? | a trait that increases an organisms ability to survive and reproduce |
What is artificial selection? | only an organism with a desired trait is bred- so trait will be passed on |
What is natural selection? | process of adaptations of organism make them better suited for their environment and therefore have greater survival and ability to reproduce |
What factors affect natural selection? | Overproduction
Competition
Selection
Environmental change
Genes and natural Selection
Variation |
What is overproduction? | Too many produced not enough food, water, and space available to survive |
What is variation? | differences within a species |
What is competition? | competition for food, living space, etc usually indirectly |
What is selection? | better adapted to environment-> better survival -> pass traits onto offspring |
What is environmental change? | Change in environment can change in ability survive |
What is genes and natural selection? | without variation all species have some traits/ chance of survival |
Where does variation come from? | Change in gene/ shuffling of eggs and sperm |
What did Darwin propose about natural selection? | overlong time, natural selection can lead to change- helpful variations increase, unfavorable may disappear |
How do species go extinct? | |