Evolution Flashcards
Evolution
the process by which a species changes over time
Use & Disuse Theory
Jean Baptiste Lamark
“All species descend from other species”
some internal force causes an organisms to produce offspring slightly different from self
The part of the body that were extensively used would become larger and stronger, whereas those parts not used would waste
Inheritance of acquired characteristics
Inheritance of acquired characteristics
During the life of an organism, they could acquire characteristics to help them survive better, any changes acquired can be past to offspring.
Weismann’s experiement
Cut the tail 22nd consecutive generations of mice, the 23rd generation of mice still born with tail.
Debunking Lamark’s theory
What is the location that Darwin most known for?
Galapagos Island
What animal did Darwin study?
Finches & Iguanas
What did Darwin propose about the finches on the island?
The finches on the island evolved from a single species of finch from S. America mainland.
What are the two parts of Darwin’s theory?
Common descent & adaptation
Common Descent
all species have a single common ancestor
Adaptation
modifications that enable organisms to be better suited for their environment
What causes adaptations?
mutations
What was Darwin’s theory called?
Natural Selection
Variations
the difference among individuals in a species
What causes variation among individuals in a species
mutations
What are the types of evolution?
Macroevolution & microevolution
