Dogs with hypoallergenic fur

The long neck of a giraffe

Changing colors of a chameleon

Thorns on a rose bush

Dogs with hypoallergenic fur

The long neck of a giraffe

Changing colors of a chameleon

Thorns on a rose bush

Non-random mating

Large population numbers

No mutations entering the population

No new organisms entering the population

Non-random mating

Large population numbers

No mutations entering the population

No new organisms entering the population

Prairie dogs with darker fur colors get eaten more often by predators than prairie dogs with lighter fur

A falling rock crushes half of the flowers on a hill, but leaves the other half alive

Dogs are groomed by humans for desired traits

Organisms can only reproduce with other organisms of their species

Prairie dogs with darker fur colors get eaten more often by predators than prairie dogs with lighter fur

A falling rock crushes half of the flowers on a hill, but leaves the other half alive

Dogs are groomed by humans for desired traits

Organisms can only reproduce with other organisms of their species

Both genes are on the same chromosome

Both genes are always expressed in an organism at the same time

Both genes are used for the same function in the organism

The genes are directly next to each other

Both genes are on the same chromosome

Both genes are always expressed in an organism at the same time

Both genes are used for the same function in the organism

The genes are directly next to each other

Cenozoic

Mesozoic

Paleozoic

Precambrian

Cenozoic

Mesozoic

Paleozoic

Precambrian