Chapter 13 Flashcards
Which process did Jean Baptiste Lamarck suggest that organisms evolved by?
Process of Adaptation
What are adaptations?
Features of an organism that assist in survival or reproduction
Name an erroneous idea that Jean Baptiste Lamarck suggested
Inheritance of acquired characteristics
What is cumulative selection
When less complex forms have survival values, and layers of complexity build on top of themselves.
First key observation that Darwin based his theory of natural selection on.
All species tend to produce excessive numbers, which leads to struggle for existence
Second key observation that Darwin based his theory of natural selection on.
Variation exists among individuals in a population, much of this variation is heritable.
What is evolution
Change over time
What Is Natural Selection
Mechanism For The Change
What shares similarity due to common ancestry
Homologous structures
What is comparative embryology
Comparison of structures that appear during development of different organisms
Of all causes of microevolution, only natural selection promotes _____
Adaptation
Directional Selection….
- Shifts phenotypic curve of population
- Selects in favor of some extreme phenotype
Disruptive Selection…
- Can lead to balance between 2 or more contrasting morphs in population
Stabilizing Selection…
- Maintains variation for particular trait within narrow range
When did Darwin leave Britain on the HMS Beagle
December 1831
What intrigued Darwin during his trip….
Geographic Distribution of organisms on Galapagos Islands, they resembled those in south America.
Who’s writings was Darwin strongly influenced by?
Charles Lyell
What book was published on November 24th, 1859?
The origin of species by means of natural selection
