Unit 2 Biodiversity Flashcards
species diversity
variety of species
genetic diversity
variety of genes.
how many species
2 million named. 10 million estimated
species richness
number of species in an area
species evenness
relative abundance of each species
phylogeny
branching patterns of evolutionary relationships
genetic drift
small populations can change quickly. change in genetic composition of population over time as a result of random mating.
bottleneck effect
drastic and sudden drop in population size
founders effect
change in population from a small number of colonizing individual
allopatric speciation
when a species is isolated for so long they can’t interbreed when they are reintroduced.
Sympatric speciation
Evolution occurs without separation
inbreeding depression
when relative breed and cannot produce a viable offspring
anthropocentric
human centered . nature should provide for our needs
biocentric
life centered saying humans are part of all life and all species have equal value
ecocentric
earth centered