Fossil findings that support
evolutionary theory
Problems/Case Studies
"An
Antipodal Mystery" Clyde Freeman Herreid, University at
Buffalo. State University of New York at Buffalo’s National Center
for Case Study Teaching
The discovery of the platypus had
the scientific world in an uproar and kept it tantalized for
decades. Here was the strangest animal ever seen. How was one to
classify it? It had fur. So, was it a mammal? But then what to
make of its duck-like bill? And how did it produce and suckle its
young? This interrupted case, based on the book by Ann Moyal
entitled Platypus: The Extraordinary Story of How a Curious
Creature Baffled the World, focuses on classification and
evolution and models the scientific process, with scientists
arguing, debating, collecting more information, and revising their
opinions as more data become available.
This case is appropriate for
high school general biology classes, and undergraduate
evolutionary biology and zoology courses.
"A
Strange Fish Indeed: The “Discovery” of a Living Fossil" Robert H. Grant,
Saint Louis University. State University of New York at Buffalo’s
National Center for Case Study Teaching
Marjorie Courtenay-Latimer's
discovery of an extraordinary looking fish in South Africa in 1938
and its identification by J.L.B. Smith of Rhodes University as a
coelacanth (a fish believed to be extinct for over 70 million
years) caused a sensation around the world. This case study
recounts the discovery through a series of fictionalized diary
entries.
Developed for use in an
introductory freshman biology course as an introduction to the
nature and methods of scientific inquiry, the case could also be
modified for use in a number of upper-level biology courses such
as ichthyology, evolutionary biology, and conservation ecology.
"The Missing Link" Elizabeth Strasser, California State
University, Sacramento. State University of New York at Buffalo’s
National Center for Case Study Teaching
The setting for this case study is a
paleontological dig in East Africa, where Sam, an American
undergraduate student, has unearthed part of what appears to be an
ancestral human skull. In the lab, students examine a number of
primate skulls and are asked to make up a phylogeny based on their
observations.
The is case study is designed
for a lower division, general education laboratory course that
accompanies a lecture course in physical (biological)
anthropology..
"Of
Mammoths
and Men: A Case Study in Extinction" Nancy A. Schiller,
University at Buffalo. State University of New York at Buffalo’s
National Center for Case Study Teaching
The recent discovery of a mammoth
frozen in the Siberian tundra is the backdrop for this case study,
which explores the various theories for the extinction of the
great Ice Age mammals and Homo
neanderthalensis. Students
research evidence for and against the different hypotheses and
then discuss in class the merits of each.
The case was designed for use in
a freshman evolutionary biology course. Instructors of courses
in anthropology and paleontology might also find it appropriate.
"The
Dating
Game: A Case Study in Human Evolution" Shoshana Tobias,
University at Buffalo. State University of New York at Buffalo’s
National Center for Case Study Teaching
In this role-playing case study,
students attempt to determine the identity of a variety of human
fossils based on characteristics described during a "quiz show.
The case was designed to be used
in a general biology class for freshman students where the focus
is on evolution. It could also be used in an anthropology or
paleontology course.
"Alien
Evolution:
The Return of the Cambrian Explosion" Shoshana Tobias,
University at Buffalo. State University of New York at Buffalo’s
National Center for Case Study Teaching
In this case, which combines
problem-based learning and role-playing, students research the
environmental conditions of the Cambrian period and the types of
organisms that developed during that time as they speculate about
possible cases for the "Cambrian Explosion."
"Seven
Skeletons
and a Feather: The Mysteries of Archaeopteryx".
Clyde F. Herreid, University at Buffalo. State University of New
York at Buffalo’s National Center for Case Study Teaching
This problem-based learning case
uses Archaeopteryx, the most famous fossil in the world,
to show the vital role that fossils play in understanding
evolutionary history and to explore the different theories for the
origin of flight and the ongoing debate over a bird-dinosaur
connection.
The case was designed for an
introductory biology course where the focus is on evolution. It
would also be appropriate for classes in geology.
CNN Video Clips
Topic: "Chad Fossil Find": Biology 7th Ed. CNN Ed 2003
(2:20)
A team headed by French paleontologist Michel Brunet has
discovered a 6–7 million year old fossil they claim is a human
ancestor. The fossil, nicknamed Toumai, was discovered in Chad.
The skull is humanlike in having a flat face, protruding brow, and
teeth, but the body seems to have been more like that of a
chimp. Experts disagree about where exactly the new find
fits in the hominoid family, but all agree that it is an important
find. It is the oldest humanlike fossil and the first
discovered in West Africa.
(Student worksheet provided on CD)
Topic: "Winged Reptiles": Biology 8th Ed. CNN Ed 2004
(1:25)
Recent examination of two fossil pterosaurs provides new
information about the animals’ flying abilities. One fossil
pterosaur was about the size of a crow, the other the size of a
small plane. CAT (computerized axial tomography) scans of the
brain of the larger fossil showed that certain regions were highly
developed. This suggests that the animal was a highly agile flyer.
Analysis of the fossils also showed that pterosaurs fly with their
heads facing downward. (Student worksheet provided on CD)
Topic: "Mystery Ape": Biology 6th Ed. CNN Ed 2002 (3:07)
In North Central Congo there is evidence of an ape unlike any
described species. Mitochondrial DNA evidence suggests that
the animal is a chimpanzee. It is, however, larger than a typical
chimpanzee, In addition, it displays different behavior and has a
gorilla-like bony crest on its skull. One theory is that it is a
hybrid between a male gorilla and a female chimpanzee. (Student
worksheet provided on CD)
Topic: "Human Ancestor": Biology 6th Ed. CNN Ed 2002 (2:00)
The discovery of a one million-year-old skull in Ethiopia is the
first evidence that Homo erectus was still living in Africa at the
time that modern humans arose there. That means this species could
be our direct ancestor. Anthropologist Henry Gilbert believes that
Homo erectus gave rise to Homo sapiens in Africa,
lending support to the African emergence model of human evolution.
(Student worksheet provided on CD)
Topic: "Earliest Homo sapiens": Biology 8th Ed. CNN Ed 2004
(1:42)
A 160,000-year-old fossil skull discovered in Ethiopia
provides a new glimpse at our early ancestors. The skull appears
to be from a 20- to 30-year-old man. A second skull found nearby
is of a child. Tim White of the University of California (UC) at Berkeley
classifies the fossils as members of a new subspecies that he
calls Homo sapiens idaltu. Compared to modern humans, these
ancestors had a slightly larger skull and brain case, and a
slightly longer face. Tools found in the same area as the fossils
were probably used to hunt game. The worksheet provides the URL
for an interview with Professor White on the Institute of International Studies,
UC Berkeley website. (Student worksheet provided on CD)
Articles
"The Mammals That Conquered the Seas" Wong,
Kate. Current Issues in Biology. Scientific American, Inc. May
2002. 32-43.
The evolutionary history of whales has always been a mystery,
but more information is being learned today than ever before with
the help of numerous fossils and DNA analysis. This article
details much of the fossil data on the evolutionary journey of the
whale. The article is followed by a comprehension quiz and
critical thinking questions.
"Our youngest
ancestor only 3.3M years old". Bob Stein. Post and Courier.
Fossilized remains of a child who
died 3.3 million years ago, belonging to the same species as
“Lucy”, was discovered in Ethiopia. The skeleton illustrates the
hybrid nature of the ancestral line of humans, combining human and
ape characteristics.