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Taxonomy - PowerPoint PPT Presentation


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Prokaryotic Cell. Eukaryotic Cell. Autotrophs capture the light energy from sunlight and convert it to chemical energy they use for food. Heterotrophs must get energy by eating autotrophs or other heterotrophs. Decomposers , aka saprobes , are heterotrophs

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Presentation Transcript
slide3
Autotrophs capture the light energy from sunlight and convert it to chemical energy they use for food.
  • Heterotrophs must get energy by eating

autotrophs or other heterotrophs.

  • Decomposers, aka saprobes, are heterotrophs

that recycle dead organisms by breaking them

down.

slide5

Phylogeny

  • Systematics Hypothesis
  • Cladistics
  • Derived character
  • Cladogram
  • Dichotomous Key
  • Order
  • Family
  • Genus
  • Species
  • Common name
  • Scientific
  • name
  • Binomial
  • nomenclature
  • Classification
  • Taxonomy
  • Aristotle
  • Linnaeus
  • Kingdom
  • Phylum
  • Class
slide6

Taxonomy is the science of grouping

  • and naming organisms.
  • Classification the grouping of
  • information or objects based on
  • similarities.
slide7

We only know about a fraction of the

  • organisms that exist or have existed on Earth.
  • Taxonomists give a unique scientific name to
  • each species they know about whether it’s alive
  • today or extinct.
  • The scientific name comes from one of two
  • “dead” languages – Latin or ancient Greek.

Why use a dead language?

slide15

There are at least 50 common names for

  • the animal shown on the previous 7 slides.
  • Common names vary according to region.
  • Soooo……why use a scientific name?
slide16

a two name system for writing scientific names.

  • The genus name is written first (always Capitalized).
  • The species name is written second (never capitalized).
  • Both words are
  • italicized if typed or underlined if hand written.
  • Example: Felis concolor or F. concolor
  • Which is the genus? The species?

Binomial Nomenclature

slide17

"Formal" scientific names should have a third part, the authority.     The authority is not italicized or underlined.

The authority is written as an abbreviation of the last name of the person responsible for naming the organism. Since Carolus Linnaeus was the first person to name many plants, the L. for Linnaeus is very common in plant scientific names.

An example is Quercus alba L.

slide18

Phylogeny, the evolutionary history of anorganism, is the cornerstone of a branch of biology called systematic taxonomy.

Systematics, as systematic taxonomy is commonly called, is the study of the evolution of biological diversity.

slide19

A phylogenetic tree is a family tree that shows ahypothesis about the evolutionary relationships thought to exist among groups of organisms. It does not show the actual evolutionary history of organisms.

Why a hypothesis?

slide21

Phylogenetic trees are usually based on a combination of these lines of evidence:

    • Fossil record
    • Morphology
    • Embryological patterns of development
    • Chromosomes and DNA
slide24

Homologous

Structures

slide25

modifies

homologous

structures

Adaptive Radiation -

Modifies homologous structures

slide27

Convergent Evolution

These animals have evolved similar adaptations

for obtaining food because they occupy similar

niches. What can you infer about their

phylogeny from their geographic locations?

slide28

Convergent evolution leads to……….

  • Analogous Structures  -
  • Traits that are morphologically and
  • functionally similar even though there
  • is no common ancestor.
slide33

Cladistics- is a relatively new system of phylogenetics classification that uses shared derived characters to establish evolutionary relationships. A derived character is a feature that apparently evolved only within the group under consideration.

slide35

There are three basic assumptions in cladistics:

    • Organisms within a group are descended from a common ancestor.
    • There is a bifurcating pattern of cladogenesis.
    • Change in characteristics occurs in lineages over time.
slide36

A phylogenetic tree based on a cladistic analysis is called a cladogram.

What derived character is shared by all the animals on the cladogram on the next slide?

slide38

The acacia and its

ants are an example

of coevolution. Each

influences the others

evolution.

Can you think of any

other examples of

coevolution?

slide39

Punctuated Equilibrium

“instead of a slow, continuous movement, evolution tends to be characterized by long periods of virtual standstill ("equilibrium"), "punctuated" by episodes of very fast development of new forms”

The "punctuated equilibrium" theory of Niles Eldredge and Stephen Jay Gould was proposed as a criticism of the traditional Darwiniantheory of evolution…what is it called?

slide40

A key is a device for easily and quickly identifying

  • an unknown organism.
  • The dichotomous key is the most widely used type in biological sciences.
  • The user is presented with a sequence of choices between two statements,couplets, based on characteristics of the organism. By always making the correct choice, the name of the organism will be revealed.

The Dichotomous Key

slide42

1.

A. one pair of wings

B. Two pairs of wings

slide43

The Three Domains

  • • Domain Archaea
      • Includes newly discovered cell types
      • Contains 1 kingdom – the Archaebacteria
  • Domain Bacteria
      • Includes other members of old kingdom Monera
      • Has 1 kingdom – the Eubacteria
  • Domain Eukarya
  • Includes all kingdoms composed of organisms made
  • up of eukaryotic cells
        • – Protista
        • – Fungi
        • – Animalia
        • – Plantae
slide44

The major classification levels,from most general to most specific

(several of these have subdivisions)

A group at any level is a taxon.

slide45

Kingdoms are divided into groups called phyla

Phyla are subdivided into classes

Classes are subdivided into orders

Orders are subdivided into families

Families are divided into genera

Genera contain closely related species

Species is unique

Categories within Kingdoms

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