Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Human Evolution

No description
by

Kevin Goodenough

on 30 May 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Human Evolution

Human Evolution
What is Evolution??
Evolution is the change in the
inherited
characteristics of biological
populations
over successive generations.
Evolution is responsible for
variation
within species, individual organisms and molecules such as DNA and proteins.
Human evolution is the evolutionary process leading up to the appearance of
modern
humans.
Human evolution really began with the last common
ancestor
of all life, but we regard it now as emergence from apes.
Anatomical Changes in Humans
Human evolution has seen a large number of
morphological
, developmental, physiological, and behavioral changes that have occurred since the
branching
off between the last common ancestor of humans and chimpanzees.
Morphological - form and
structure
of organisms
Developmental - the
process
of growing to maturity
Physiological - the study of
function
in living systems
Behavioral - range of
behaviors
displayed by humans and which are influenced by many things
Types of Anatomical Changes
Bipedalism - the form of terrestrial (on land)
locomotion
where an organism moves by means of its two rear limbs, or legs
This is the main cause behind most of
skeletal
changes shared by all bipedal hominids.
Encephalization - the amount of brain mass related to an animal's total
body
mass
The more brain mass per body weight, the more
intelligent
the species
The human species developed a much larger brain than that of other primates, over twice the size of that of a chimpanzee or
gorilla
Other anatomical changes in humans include: reduction in sexual
dimorphism
(human males and females look similar), well developed chins (prognathism), sweat glands, and a
descended
larynx (allows us to talk)
Warm Up
Why is it necessary for humans and animals to change over time? What might happen if they could not change?
Why do you think hands evolved before feet? (Think about everything you know about how humans came to be)
Divergence
Evolutionary history of the primates can be traced back
65 million
years
Molecular evidence suggests that around
8 million
years ago, first the gorillas, and then the chimpanzees split off from the line leading to the humans
The earliest fossils that have been proposed as members of the hominin lineage date back
7 million
years
From these early species, the australopithecines arose around
4 million
years ago and probably went on to become ancestors of the genus Homo
The earliest members of the genus
Homo
are
Homo

habilis
which evolved around
2.3 million
years ago.
Homo habilis
is the first species for which we have positive
evidence
of the use of stone tools.
Do Now: Why is learning how to use tools helpful to survive?
Homo sapiens
Sapiens is Latin for "wise" or "
intelligent
"
This is what modern humans are
Lived from about
250,000
years ago to the present
About 250,000 years ago, skulls sizes started rapidly expanding and stone tool
technologies
developed, providing evidence for a transition from
H. erectus
to
H. sapiens
.
Research has shown that humans are very
similar
genetically
The
DNA
of individuals is more alike than usual for most species
This may have resulted from relatively
recent
evolution or possibly a population bottleneck
Homo sapiens
outcompeted
Homo sapiens neanderthalensis (Neanderthals),
that is why they are extinct
Could you outcompete a
Neanderthal?
Exit Question
Are
Homo sapiens
Still Evolving?
Yes, Natural selection occurs in modern human populations.
Mutations in humans are being discovered all the time
Remember, not all mutations are good!
Full transcript