Pace of Evolution Flashcards
1 new species every
3 million years
Four factors influence successful survival
Enviromental Change
Genetic Variation
Population change
Generation Time
Rate of environment change
A slowly changing environment species more time to adapt to changes
Genetic Variation
Less genetic variation means there is less chance for the species to adapt to changing conditions
Population size
If beneficial mutation occurs it can spread more rapidly in small population than in the large population
Generation Time
Shorter generation times increase the chance that beneficial mutations will occur within a given amount of time and allow them to spread throughout a population faster
Ability of a species to adapt to change
Genetic Engineering
Directly manipulating genes
Genetically Modified Organisms
Organisms with inserted genes
Evolution shapes ecological
Niches and determines species distributions
Range Tolerance
limits to the abiotic conditions they can tolerate
Fundamental Niche
Ideal Conditions
Niche
The role an organism plays in the environment
Realized Niche
Where the organisms actually lives
Environmental changes and species extinctions
99% of all species that have ever lived on earth are now extinct
99% of all species that have ever lived on earth are now extinct, why?
No favorable habitat
