Transcript Lecture chpt. 22 Evolutn Show 2 Evdnse

Chpt. 22
Evidences of Evolution:
Evidences of Evolution:
Evidences of Evolution:
Other Evidences of Evolution:
1. Comparative Anatomy
Anatomical similarities
between species in the same
“taxonomic” category.
Other Evidences of Evolution:
HomologySimilar structure resulting
from common
ancestry/different function.
Homologou
s
structures
Evidences of Evolution:
Similar
structure
resulting
from
common
ancestry/
different
function.
similar structure,
different function
Evidences of Evolution:
similar structure,
Similar
structure
different function
resulting
from
common
ancestry/diffe
rent function.
Vestigial Organsstructures with only
marginal importance
Historical
remnants of
snake “legs”
structures that
had important
functions in
Vestigial Organsstructures with only
marginal importance
Vestigial Organsstructures with only
marginal importance
Historical
remnants of
snake “legs”
structures that
had important
functions in
Vestigial Organsstructures that seem to
have lost their
Historical
functionality remnants of
structures that
had important
functions in
eye bulbs
Vestigial Organsstructures that seem to
have lost their
functionality
Historical
remnants of
structures that
had important
functions in
wings
Other Evidences of Evolution:
Embryological-
limb buds - dolphin
Closely related
organisms go
through similar
stages in their
embryological
development
Other Evidences of Evolution:
Embryological-
pharyngeal pouches
Closely related
organisms go
through similar
stages in their
embryological
development
Other Evidences of Evolution:
Molecular HomologiesDNA / RNA
amino acid
sequence
Other Evidences of Evolution:
Molecular HomologiesDNA / RNA
amino acid Species have
genes and
sequence
protein
sequences that
match closely
Evidences of Evolution:
2. Biogeography - the
geographic distribution of
species
Evidences of Evolution:
2. Biogeography ??Why are two islands,
same environment, found in
two different parts of the
world, not found with similar
species??
Evidences of Evolution:
2. Biogeography
Why are island species similar
to their mainland (even when
not the same environment)??
Evidences of Evolution:
2. Biogeography
??Why are species that are
similar to those on the
mainland…
not similar to
those found in the same
environment elsewhere??
Evidences of Evolution:
3. Fossil Record- (ex.
vertebrates) Chronological
appearance of different
classes of organisms: birds
mammals
reptiles
amphibians
Evidences of Evolution:
3. Fossil Recordillustrates that organisms
did not make their
appearance at the same
time.