SPECIES CONCEPT & HIERARCHICAL TAXONOMIC CLASSIFICATION.pptx

Grade 8 Learners Module

1. SPECIES CONCEPT & HIERARCHICAL TAXONOMIC CLASSIFICATION MODULE 4, WEEK 4

2. species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity.  2 20XX

3. FOUR DEFINITIONS OF SPECIES CONCEPT: 3 Presentation Title 20XX

4. 1. Morphological Species Concept (MSP)- Groups of organisms that share identical morphological (physical structures) characteristics. Click to add photo

5. All organisms have physical traits, and they may have the same morphological structures but belong to a different species. 5 Presentation Title 20XX Limitations:

6. 2. Biological Species Concept (BSC) -groups of interbreeding natural populations that are reproductively isolated from such groups” Click to add photo

7. Limitations: Organisms may be alike but of different species, as They can mate but produce infertile offspring. 7 20XX Example: Asian elephants and African elephants which are reproductively isolated can produce calves if they are able to meet because they belong to the same species .

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9. 3. Typological Species Concept (TSC) Aristotle and Carolus Linnaeus thought of each species as a set of organisms that resemble one another and are distinct from other sets. Click to add photo

10. Limitations : Due to several phenomena such as sexual dimorphism (difference in form between individuals of different sex in the same species), polymorphism (genetic variations among members of single species), and age differences, the same species develop strikingly morphological differences 10 20XX Example: ducks of same size and color are included in one species

11. 4. Nominalistic Species Concept (NSC) believed that only individuals exist while species are man’s creation. Organisms were only termed as species for the sake of classifying closely-resembled individuals. In 1859, together with Alfred Wallace, Charles Darwin considered “species as the fundamental units of evolution” which provided the most coherent and detailed definition and since Earth is composed of huge biodiversity of living things. We should be able to understand how they are related to one another Click to add photo

12. Taxonomy deals primarily with the description, identification, nomenclature and classification of organism .

13. HIERARCHICAL TAXONOMIC CLASSIFICATION Carolus von Linnaeus “Father of Taxonomy” Introduce Binomial nomenclature (two-part name for species) and hierarchical classification as an organized way of naming and describing organisms and their relationship to one another. Click to add photo

14. 8 TAXONOMIC CLASSIFICATION

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18. ACTIVITY Arrange the taxonomic classification of the given organism. GROUP 1: DOG GROUP 2: CAT GROUP 3: FOX GROUP 4: WOLF