Download Predator-prey "arms race"

Homologous Vs. Analogous
Structures
Homologous Structures (flowers)
Broccoli and Cauliflower evolved from
Mustard
print
Hom
olog
y: A
Bouq
uet
of
Broc
coli
One
woul
dn't
nor
mall
y
mun
ch
on a
rose
bud
or
snap
off a
dand
elion
flow
er
for a
quic
k
snac
k.
But
in
fact,
in
term
s of
hom
ologi
es,
whe
n
you
eat
broc
coli
or
cauli
flow
er,
you
are
doin
g
just
that.
Alth
ough
not
scen
ted
or
suita
ble
for
cent
erpi
eces,
the
gree
n
tips
of
broc
coli
and
the
whit
e
tips
of
cauli
flow
er
are
actu
ally
flow
ers.
Thro
ugh
man
y
gene
ratio
ns of
artifi
cial
selec
tion,
farm
ers
modi
fied
the
brig
ht
yello
w
bloo
ms
of
the
wild
must
ard
plan
t
into
the
edibl
e,
vege
tal
plan
t
part
s
you'l
l find
nestl
ed
next
to
the
ranc
h dip
on
the
hors
d'oe
uvre
tray.
The bones of the bat, mouse, and
human are homologous.
The wings of the bat, butterfly, and bird are made of different
coverings, and insects do not have internal bones. The wings are
analagous. They have the same function and shape, but are made
differently.
Convergent Vs. Divergent
Evoultion
Analagous structures help to show
Convergent Evolution
Convergent Evolution
• Organisms that are NOT related
evolve similar traits as a result of
evolving to fit into similar
environments or ecological
niches.
In different parts of the world, ant
eating animals developed long snouts
and powerful digging paws.
Convergent Evolution
Divergent Evolution
• a group from a specific population develops
into a new species. In order to adapt to
various environmental conditions, the two
groups develop into distinct species due to
differences in the demands driven by the
environmental circumstances.
Darwin’s finches show a path towards
divergent evolution. The birds’ beaks
are shaped differently so they can
occupy different niches in the
ecosystem.
Embryonic Development
• Analyzing the embryos of
animals shows that the
more closely related the
animals are, the more alike
their embryos are during
development.
Evolutionary Branching Tree
• Like a family tree, it shows how organisms
evolved from common ancestors that may no
longer be alive on earth today.
• Evolutionary branching trees can show how
adaptation leads to new species over time.
Predator-prey "arms race"
Predators evolve better ways to
catch prey,...
"Drive, George, drive! This one's got a coat hanger!"