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

Charles Darwin

No description
by

Jonathan Waddell

on 5 June 2016

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Charles Darwin

Charles Darwin
On the origin of species
Natural selection
and mutations

Naturalism: precursors for Darwin
18th century contributions to "Naturalism"
- Fixity and special creation became discredited
- Extinction of species
- Taxonomy (binomial nomenclature)
- Mass extinction events
- Old world
- Mechanism for evolution suggested:
- Diversity + Adaptation
- Possible common decent
- Vestigial Structures
Darwin sets sail
- Given task to expand knowledge of natural resources of the british empire
HMS Beagle
Galapagos Islands
Darwin observed intensely varied geological and biological diversity along his journey
Many of his observation led him to theorize about the relation all organism have to one another
Animals of the Galapagos Islands
Each Galapagos Island had its own type of tortoise
Darwin perceived this to be a result of the differing environments the islands displayed
Ex: Island with lots of low foliage had short necked turtles
Darwin's return
- Proposed
natural selection
- populations have inheritable variations
- populations produce more offspring than an environment can support
- some traits allow individuals to better compete for resources (fitness)
- Thus the favored trait will increasingly be passed down to the following generations
Artificial Selection
- Humans choose specific desirable traits
- ex: Several variations of dogs can be traced to a common ancestor
Survival of the fittest?
fitness - an organisms ability to survive and reproduce in environment

.... as a result, traits that increase an organisms fitness are more likely to be passed on to subsequent generations
Mutations? good, bad or otherwise...
Definition
- permanent change in the sequence of bases in DNA

Causes
-spontaneous(no apparent reason)
- random chemical changes
- copying errors

- Induced
- caused by mutagens (radiation and organic chemicals) called carcinogens(cancer causers)
Sexual selection
- When specific traits that lead to increased ability to secure a mate.
- Because females generally produce few eggs, mate selection becomes a serious consideration
- Good gene hypothesis
- Runaway hypothesis
Ecological selection
-Inheritance of specific traits determined by ecology alone
- Without direct sexual competition when
-e.g. sexual competition is strictly ecological
-there is little or no mate choice,
-females do not resist any male who wishes to mate,
-all traits will be equally propagated regardless of mating
-or the species is hermaphroditic or asexually reproducing (bacteria)
Full transcript