Scientific Classification Systems Why a Scientific Classification System? Ambiguity of terms Latin...

ScientificClassification

Systems

Why a Scientific Classification System?

Ambiguity of terms Latin “dead

language” Categorization of

relationships:1. Evolutionary2. Structural3. Biochemical

(NOT habitat)

7 Classification Groups: Kingdom (most inclusive) Phylum Class Order Family Genus Species (most specific)

King Phillip Came Over From Greece Singing

5 Major Kingdoms:1. Monera

2. Protista

3. Fungi

4. Planta

5. Animalia

1 cell, prokaryotes 1 cell, eukaryotes &

algae Multicelled, absorptive

feeders Muticelled, autotrophs Muticelled

heterotrophs

Which is the most difficult to assign?

Species: Most specific Successful

interbreeding Fertile

offspringDonkey + Horse=Mule (infertile)

Which group has the largest # organisms?Kingdom: Cell types

ProkaryotesEukaryotes

Cell number Nutrition Structures

Plant Kingdom

Animal Kingdom

Scientific Name: Latin Italics or underlined Genus species Homo sapien

Classification Criteria: Biochemistry Behavior Hair Color Genetic System Evol. History Nutrition Molecular Make-up

Most (DNA) Not very Not very Most Most Most Not very

Similar Categories:

Dolphin Man Fish Whale Bat

Similar Categories:

GrasshopperMosquitoSpiderButterfly

Did Man evolve from Apes? No!! Similar ancestor Both:

Animalia

Cordata

Mammalia

Primates

Hommindes

The Piltdown Man was accepted as an important archaeological find in 1912 because it seemed to bridge the evolutionary gap between apes and man. It was not until 1953 that, with the help of fluorine dating tests, the bones were determined to be the jaw of an orangutan with the skull of a man, both from the Middle Ages. Here, Alvan Marston explains that it is not a missing evolutionary link, but a “most elaborate hoax.”

Hulton Deutsch

"Uncovering the Piltdown Hoax," Microsoft® Encarta® Encyclopedia 2000. © 1993-1999 Microsoft Corporation. All rights reserved.

Mammals arise from Theraapsids

Chimpanzees: distant relatives

Walking upright:

Unlike their ape ancestors, early humans had anatomical adaptations for upright walking. The early human species Australopithecus afarensis had a wide and short pelvis and femurs (upper leg bones) that angled inward toward the knees. These adaptations provided side-to-side balance and a fulcrum for the hip muscles to hold the torso erect. In contrast, apes, such as chimpanzees, have a tall and narrow pelvis from which the femurs extend straight down.

© Microsoft Corporation. All Rights Reserved.

"Evolution of Upright Walking," Microsoft® Encarta® Encyclopedia 2000. © 1993-1999 Microsoft Corporation. All rights reserved.

Lemurs: distant relatives

The ruffed lemur lives in the eastern rain forests of Madagascar. The lemurs and their relatives are believed to have evolved in isolation from the monkeys and apes after Africa became separated from Madagascar over 50 million years ago. Since the arrival of humans on Madagascar over 2000 years ago, at least 14 species of lemurs are believed to have become extinct. Jean P. Varin/Jacana/Photo Researchers, Inc."Ruffed Lemur," Microsoft® Encarta® Encyclopedia 2000. © 1993-1999 Microsoft Corporation. All rights reserved.

Piltdown “hoax”

When Charles Darwin published The Descent of Man in 1871, he challenged the fundamental beliefs of most people by asserting that humans and apes had evolved from a common ancestor. Many critics of Darwin misunderstood his theory to mean that people had descended directly from apes. This caricature of Charles Darwin as an ape appeared in the London Sketch Book in 1874.

Mary Evans Picture Library/Science Source/Photo Researchers, Inc.

"Caricature of Charles Darwin," Microsoft® Encarta® Encyclopedia 2000. © 1993-1999 Microsoft Corporation. All rights reserved.

Homologous or Analogous Stuctures?

Homologous Structures: Shark/Dolphin fin Seal flipper/Fish fin Fish tail/Whale fluke Bat wing/Cat limb Bird/Insect wing Bird wing/reptile limb Seal flipper/human

arm Dog limb/whale flipper

No (cartilage/rays) No (bones/rays) Yes (bones/bones) Yes (bones/bones) Yes (bones/no bones) Yes(bones/bones) Yes(mammal bones) Yes(mammal bones)

Structures that are similar due to evolutionary origin, such as the forearm bones of humans, birds, porpoises, and elephants, are called homologous. Structures that evolve separately to perform a similar function are analogous. The wings of birds, bats, and insects, for example, have different embryological origins but are all designed for flight.

© Microsoft Corporation. All Rights Reserved.

"Analogous and Homologous Structures," Microsoft® Encarta® Encyclopedia 2000. © 1993-1999 Microsoft Corporation. All rights reserved.

Family or Genus Relations?Family: Less closely related Larger group

Genus: More closely related Precedes species=

interbreeding

Family:Felidae Lions, tigers,

leopards house cats,cheetahs,

ocelotsGenus: Panthera Leopards (pardus) Lion (leo) Tigers (tigris)

Feline Family Members:

Most authorities agree that the domestic cat descended from the Caffre cat, a small breed of African wildcat. The Caffre cat was domesticated in ancient Egypt, possibly as early as 2500 BC.

G. G. Dimijian/Photo Researchers, Inc.

"Caffre," Microsoft® Encarta® Encyclopedia 2000. © 1993-1999 Microsoft Corporation. All rights reserved.

Genus: Panthera (Lions &Tigers)

Classification by characteristics: Fossil Skulls DNA

Sequences Hair

Samples Pictures

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