Biology Topic 4 Flashcards
The variety of living organisms in an area.
Define species diversity
The number of different species and the abundance of each species in an area.
Define genetic diversity
The variation of alleles within a species
When a species is unique to a single place
What is a niche
the role within the community
What is anatomical adaptations
physical adaptations(external or internal that improves chances of survival e.g. fur to keep warm
What is behavioural adaptations
Changes on behaviour which improves the chances of survival e.g. mating calls
What is physiological adaptations
Processes that increase the chances of survival e.g. hibernation
What is natural selction
The process in which fitter individuals who are better adapted to the environment survive and pass on the advantageous alleles to future generations.
What is evolution
The process by which the frequency of alleles in a gene pool changes over time as a result of natural selection.
How can natural selection lead to adaptation and evolution
- A variety of phenotypes exist within a population due to mutation.
- An environmental change occurs and as a result of that the selection pressure changes.
- Some individuals possess advantageous alleles which give them a selective advantage and allow them to survive and reproduce.
- The advantageous alleles are passed on to their offspring.
- Over time, the frequency of alleles in a population changes
What are the conditions of the hardy weinberg equation
- No mutations
- Random mating
- Large population
- Isolated population
- No selection pressure
How can reproductive isolation lead to accumulation of different genetic information
New species will be formed due to accumulation of different genetic information in populations over time due to different environments and selection pressures.
What is classification
A means of organising the variety of life based on relationships between organisms using differences and similarities in phenotypes and genotypes
What are the stages of classification
Dear- Domain King- Kingdom Phillip- Phylum Come- Class Over- Order For- Family Great- Genus Soup- Species