module 6 (7) Flashcards
(9 cards)
what are the stages of population growth
slow growth
rapid growth
fluctuations by limiting factors
what are density independent factors
factors that have an effect on the whole population
define competitive exclusion principle
where two species compete for resource, the one that uses the resource more effectively will eliminate the other
what happens in interspecific competition
resource is plentiful = higher pop
higher pop = resources lower = lower pop
less competition exists = more resources = higher population
repeat the cycle
what happens in predator-prey relationships
higher prey pop = more food for preds
higher pred pop = lower prey pop
lower resources for pred = lower preds
lower pred pop = higher prey pop
repeat
what are other factors affecting predator and prey populations
availability for food
seasonal changes
other abiotic factors
how do the locations of fluorescent spots on DNA reveal which genes are most active
mRNA binds to probes by complementary base pairing
more active gene = more mRNA produced
during transcription
more fluorescence = more mRNA vound
how does the phylogenetic approach differ from the biological species concept
phylogenetic approach:
no need to test for inbreeding
common ancestors
applies to extinct organisms
apply to organisms that reproduce asexually
why is antibiotic resistance a major concern
diseases become harder to treat
potential for outbreak / epidemic
developing new antibiotics is expensive + takes time
