11.1 Mechanism of Evolution Flashcards
how does variation affect biological fitness
if the variation is helpful it will increase the fitness of the organism
an example of vartation
white vs dark fur for mice
will natural selection happen faster if the fitness of an organism is higher or lower
if it is lower like having dark fur on a white background
is natural selectoin a radomon process
no
Does natural selection involve individuals trying to adapt?
no, it’s about whole populations adapting to the trait not individual
vartation
changes in the gene pool over time
list the five fingers of evolution
Pinky- population shrinks
ring-mating
middle-mutation
index-movement, immigration
thumb-adaptions
3 requirements of natural selection
different alleles, the environment makes one variation more beneficial than another this increases the fitness of the organism, once variation gives individuals in the population a higher fitness so the variation will increase in the population over time
natural selection acts on what
populatoins not indivauls
adaptation
genetic variation that increases fitness
adaption is passed through what
germine not acquired through lifetime tho
types of selective pressures
sexual, psychological, physiological
desrcibe directional selectoin
moves from left to right
stabilizing selection
gets higher in the middle of the bell curve
disruptive selection
gets a bigger split in the middle of bell curve and turns into 2
