1. In several species of birds, the males show off their bright colors and long feathers. The dull colored females usually pick the brightest colored males for mates. Male offspring inherit their father’s bright colors and long feathers.
Compared to earlier generations, future generations of these birds will be expected to have a greater proportion of
(1) bright-colored females
(2) dull-colored females
(3) dull-colored males
(4) bright-colored males

2. Do all things evolve the same way?

3. Charles Darwin

5. Darwin’s
Finches

6. They become different species!
ADAPTIVE RADIATION
Offspring were adapted to the environments on the different islands (or they died).
Survivors reproduce and pass on traits with positive adaptive value (selected).
Genes change more and more over time.
They become different species!

7. Everyone competes for limited resources
Species adapt to different niches

8. EVOLVE!

9. The differences observed in the bird beaks are most likely due to
(1) asexual reproduction
of these finch species
(2) the selection for different
shaped beaks that best
suit different niches
(3) the genetic recombination associated with
mitotic cell division
(4) the genetic engineering of the DNA of each of these
species
REMEMBER! A niche is the
way a creature lives.

10. They have different niches!
Which two finches
would compete the
least for food?
(1) small ground finch
and large ground finch
(2) large ground finch and
sharp-billed ground finch
(3) small tree finch and
medium ground finch
(4) vegetarian finch and small ground finch
They have different niches!

11. The reason for the existence of many species of finches on the different Galapagos Islands is
(1) the abundance of
available food
(2) DNA mutations
during mitosis
that occur more
often in birds
(3) sexual
reproduction
(4) competition for
resources