DIVERSITY OF ORGANISMS
CONCEPT OF SPECIES
VARIATION BETWEEN ORGANISMS AS A DEFINING FEATURE OF
LIFE:
All living organisms → show VARIATION
↪ NO individuals show the same traits (genetic
info)
Organisms → classification (by characteristics and DNA)
↪ “modern system” published in 1735 by Carl
Linnaeus
SPECIES AS GROUPS OF ORGANISMS WITH SHARED
CHARACTERISTICS:
Linnaeus → classified organisms into → SPECIES
↪ based on shared morphological features
ORIGINAL morphological concept of a species: individuals of the same
species look more similar between each other than a different species.
, Lion (Panthera leo) & Concept works here,
tiger (Panthera tigris) they have different look
and they are different
species
Male and female of Does NOT work.
lesser birds of paradise Different aspects, but
(Paradisaea minor) they’re the same
species.
⬆
THIS WAY OF CLASSIFICATION DOES NOT WORK
BIOLOGICAL SPECIES CONCEPT
Morhphological classification doesn’t work:
- Species that look too similar
- Sexual dimorphism
- Seasonal forms
CONCEPT OF SPECIES
VARIATION BETWEEN ORGANISMS AS A DEFINING FEATURE OF
LIFE:
All living organisms → show VARIATION
↪ NO individuals show the same traits (genetic
info)
Organisms → classification (by characteristics and DNA)
↪ “modern system” published in 1735 by Carl
Linnaeus
SPECIES AS GROUPS OF ORGANISMS WITH SHARED
CHARACTERISTICS:
Linnaeus → classified organisms into → SPECIES
↪ based on shared morphological features
ORIGINAL morphological concept of a species: individuals of the same
species look more similar between each other than a different species.
, Lion (Panthera leo) & Concept works here,
tiger (Panthera tigris) they have different look
and they are different
species
Male and female of Does NOT work.
lesser birds of paradise Different aspects, but
(Paradisaea minor) they’re the same
species.
⬆
THIS WAY OF CLASSIFICATION DOES NOT WORK
BIOLOGICAL SPECIES CONCEPT
Morhphological classification doesn’t work:
- Species that look too similar
- Sexual dimorphism
- Seasonal forms
