predators

variations

traits

selections

some people have different colored eyes

some rabbits can't find enough food

all beetles have 6 legs

some finches have larger beaks

some ladybugs have different numbers of spots

true

false

the giraffe's long neck allows it to eat the leaves at the tops of trees

snowshoe rabbits have large feet that allow them to run across deep snowdrifts

humans have different colored hair

male peacocks have long, colorful tail feathers

As humans lost body hair they had to wear genes to keep their legs warm

Parents with recessive genes die from overproduction

Only traits that are controlled by genes can be acted on by natural selection

true

false

two populations of iguanas become cut off from each other by a river

two populations of frog live in the same pond but develop different mating songs

two populations of birds live in the same area but one is nocturnal and the other is active during the day

true

false

gradualism

punctuated equilibrium