Unit 1: Evolution Flashcards
(19 cards)
jean lamarck’s theory of evolution
he thought that acquired traits were inheritable
charles darwin’s theory of evolution
fact #1: species make more babies than needed
fact #2: mature populations remain stable in size
fact #3: resources are limited
inference #1: fight for resources within species
fact #4: everybody’s different
fact #5: weird parents = likely weird you
inference #2: if weird trait increases likelyhood of survival, leads to likelihood of reproduction then they pass on these weird traits
inference #3: eventually everyone has the weird trait
species (historical)
a group of individuals that actually or potentially interbreed in nature
species (modern)
the largest gene pool possible in natural conditions
speciation
a process which can result from natural selection acting upon multiple heritable traits over time
symbiosis
biological relationships between individuals or species
mutualism
both parties benefit
parasitism
one party benefits, other is harmed
commensalism
one party benefits, other is unaffected
soprophitic
decomposers
reproductive isolation
factor that prevents populations from interbreeding when they live in the same region
behavioural, geographic, temporal
behavioural isolation
signals to attract mates, elaborate behaviours, courtship rituals differ between species
geographic isolation
populations are separated by geographic borders
temporal isolation
populations reproduce at different times
evolution
changes in gene frequency of a population over time
adaptive evolution: increase in frequency of traits that can improve survival or reproduction
random evolution: frequency of traits in population due to chance events
microevolution
small change
