Classification Part 1 Biology ATAR Unit 1 Classification

Classification: Part 1 Biology ATAR Unit 1

Classification �Classification is based on the characteristics of organisms �Organisms are grouped together according to: Ø Physical characteristics eg. spinal cord or no spinal cord Ø Reproductive methods eg. sexual or asexual Ø Molecular sequences eg. similarities/differences between DNA sequences and proteins

Classification keys �Classification keys are used to identify organisms that have already been discovered and classified. �Most classification keys are dichotomous

Phylogenetic trees �Phylogenetic trees are diagrams that show the ‘evolutionary’ relationships between organisms. �It is based on the assumption that all living organisms originate from a common ancestor �A phylogenetic tree may show both extinct and living species �Phylogenetic trees are constructed using a technique called cladistics

Phylogenetic trees

Naming groups - taxonomy �Naming groups is the final step of classification �It is called taxonomy �The smallest group is the species, then genus, family, order, class, phylum and kingdom �This system of naming groups within groups is hierarchical

The bionomial system �All species are named according to a set of rules �In the Linnaeus’ system of classification, a species is given 2 names – a genus name, and a species name �The name of a species is always written with these two words together – Apis mellifera or A. mellifera for short (the honey bee) �This system of using two names is called the bionomial system

Classification activity �http: //wwwtc. pbs. org/wgbh/nova/assets/swf/1/classifylife/class. swf Classification: Bozeman science �https: //www. youtube. com/watch? v=t. YL_8 gv 7 Ri. E � 6 minutes

Links �http: //wwwtc. pbs. org/wgbh/nova/assets/swf/1/classifylife/class. swf �http: //www. youtube. com/watch? v=F 38 Bmg. Pc. Z_I �http: //www. youtube. com/watch? v=5 u. J 8 Qe. FRv. JA