Evolution By Natural Selection Flashcards
What was LaMarck’s belief about evolution
Organisms adapted to their environment by ACCQUIRING traits
(I think i can i think i can have a longer neck to reach leaves)
Disuse-
Organisms lost parts because they did not use them, like missing eyes of a tape worm
what are the four lines of evidence that support darwins ideas
fossil record, evolution of birds, evolution of land animal, evolution of marine animal
whats a homologous structure
same structure different function EXAMPLE: the radius and ulna and carpals and metacarpals that humans, cats, whales, and bats share; just they use them differently EVIDENCE OF A RECENT COMMON ANCESTOR
what is an analogous structure?
a similar solution without it being the same EXAMPLE: a dragon fly and a bird both have wings so they can fly but their wings *NO RECENT COMMON ANCESTOR
what is a vestigial structure
a structure that is still there ish or not there or was once there or is sorta gone that is no longer in use EXAMPLLLLLLEEEE: how a whale has metacarpals
what is natural selection
traits that improve survival or repdroduction will accumulate in the population adaptive change
what iis genetic drift
frequency of traits change in a population due to random chance events it is a random change
what are examples of genetic drift
bottle neck founders affect
what is bottle neck
when a disaster causes a lot of death minimizing the gene pool
what is founders affect
when a small part of the population separates (blue people of Kentucky)
Selection acts on any trait that affects —– or ——-
survival or reproduction
what are the 3 types of selection
1) predation selection
2) physiological selection
3) sexual selection `
what is predation selection
acts on predator and pray, dependent on speed, behaviors, camouflage and mimicry, and defenses
what is physiological selection
acting on body functions, disease resitance, efficiency of use of oxygen food and water
