Module 3 Flashcards
Abiotic
Non living factors
Example: Physical abiotic factors
Light, sound, temperature
Example: Chemical abiotic factors
Salinity, acidity, nitrogen levels
Biotic
Organic factors
Example: Biotic factors
Predation, mating, material made by organisms
Selective pressure
Any abiotic or biotic factor in an environment that effects an organism
Types of selective pressures
Behaviour, survival, reproduction
Adaptations
A trait that increases an organisms chance to survive and reproduce
Types of adaptations
Structural, physiological, behavioural
Evolution
Any change in the heritable traits within a population across generations
Population
A group of organisms of the same species
What can evolution not occur without
Variation, selective pressure, reproduction
Microevolution
Evolution within one population over a short time
Example: Microevolution
Peppered moth
Macroevolution
Evolution occurring across many populations over a large time scale (MYA)
Example: Macroevolution
Whales
Evidence of evolution
Comparative anatomy, embryology and development, fossil record, DNA comparison
Divergent
Seperate species evolving from one ancestral species
Convergent
Species with different ancestral origins showing similar adaptations
Graduated
Variation and selection occurring gradually with small changes over time
Punctuated
Variation and selection is sudden ad occurs in spurts
