Download Darwin`s Voyage

CELLS & HEREDITY
GRADE 7
CHAPTER 3, SECTION 2
Question
1. Who was Darwin
and what did he
observe?
Answer
Details
Charles Darwin was a
famous naturalist who
is known for his theory
EVOLUTION
of
He observed living
species and the bones
of once living species.
*On a voyage around the
world, Darwin was amazed
by the tremendous
.
DIVERSITY
among living things.
*Today, scientists have
identified more than
2.5 MILLION
species of organisms
*
SPECIES
a group of similar organisms
that can mate and produce
fertile offspring
CPS #1-2
Galapagos Intro (2:17)
Question
2. How did the organisms on the
island compare to
the organisms on
the mainland?
Answer
Similar organisms had
physical differences.
Details
*Example: Iguanas on the
islands had large claws for
GRIPPING ROCKS
Iguanas on the mainland had
small claws for
CLIMBING TREES
CPS #3-4
Galapagos Iguanas (5:36)
Question
3. What is adaptation
and evolution?
Answer
* ADAPTATIONS
are traits that help an
organism survive
* EVOLUTION
is the gradual change
of species over time
Details
*Darwin thought species had
become isolated from other
members and gradually
changed over many
GENERATIONS
becoming better adapted to
different conditions.
CPS #5
Question
4. What is natural
selection?
Answer
Process by which individuals that are better
adapted to their environment survive and
REPRODUCE
Details
*Most species produce more
offspring than can
SURVIVE
*Differences among members of a species makes
some better fit for survival
*Over time, natural selection
can lead to evolution as
helpful traits accumulate
and unfavorable traits
DISAPPEAR
CPS #6
Question
5. How do genes play
a role in evolution?
Answer
Details
Only traits that are
controlled by
*Variations in a species occur
because of differences in
GENES
can be acted on by
natural selection
GENES
*Differences are caused by
MUTATION
or shuffling of alleles during
MEIOSIS
CPS #7
Question
6. How do new species
form?
Answer
Details
A group of individuals
remains separated from
the rest of its species
long enough to evolve
*This separation is called
GEOGRAPHIC
ISOLATION
different TRAITS
*Occurred on a world-wide
scale with continental
DRIFT
*Supercontinent landmass,
PANGEA
gradually split apart
producing different species
CPS #8-9
New Life in the Galapagos? (3:38)
Sources:
Video: www.unitedstreaming.com
Pictures:
http://www.nmm.ac.uk/server/show/conMediaFile.3815/outputRegister/lowhtml
http://www.victory-cruises.com/darwin.html
http://www.rockymountainphotoadventures.com/galapagos_wildlife.htm
http://away.com/top_picks/wildlife_1.adp
http://www.galapagosonline.com/nathistory/wildlife/animals/tortoise.htm
http://www.ecuadorexplorer.com/andando/html/galapagos.html
http://www.mobirds.org/Galleries/MThelenGalapagos.htm
http://www.titusaroundtheworld.com/foto/galapagos_5.html
http://www.darwinismrefuted.com/origin_of_species_02.html
http://evolution.berkeley.edu/evosite/misconceps/IEneeds.shtml
http://library.thinkquest.org/19037/genome.html
http://www.biology.iupui.edu/biocourses/N100/2k4ch17spec.html