EVOLUTION Flashcards
darwin’s theory of natural selection
- survival of the fit
- organisms produce more offspring than can survive, therefore compete for limited resources.
- change is slow
homologous structure
come from common ancestor, similar in structure different function
analogous structure
share a common function but different internal anatomy, uncommon ancestor however may have lived in similar ecological niches
vestigial structure
evidence of evolution as it had a purpose in our ancestors lives but no longer does in our life
mimicry
animals will mimic other deadly animals so the predator won’t try to eat them
camouflage
blend in with surroundings, protects you from predators
fitness
species or organisms who have larger offspring or family
prezygotic
before it becomes a zygote, mechanisms that prevent zygote from forming, and prevention of mating/fertilization
behavioral isolation
behaviors that prevent other species from recognizing or selecting them for mating
temporal isolation
two species that live in the same habitat but have different mating seasons due to reproductive cycles
ecological isolation
two species that live in the same general area but in different habitats, do not encounter to reproduce
mechanical isolation
structural differences in reproductive organs that prevent fertilization
gametic isolation
if egg and sperm from 2 different species do happen to meet gametic isolation will ensure a zygote doesn’t form, incompatible
postzygotic
after it becomes a zygote problems with fertilization
hybrid inviability
death in womb or just after birth
