Draw out a dichotomous key using this written out key. Here Is an example 

 

A. Cells arranged in clusters

○  1. Cells not arranged in clusters → B

○  2. Cells arranged in clusters → 2

●  B. Cells arranged in chains

○  1. Cells not arranged in chains → C

○  2. Cells arranged in chains → 3

●  C. Catalase-positive

○  1. Catalase-negative → 4

○  2. Catalase-positive → 5

●  D. Non-beta hemolytic

○  1. Beta hemolytic → Streptococcus

○  2. Non-beta hemolytic → Enterococcus and Streptococcus Bovis

●  E. Coagulase-positive

○  1. Coagulase-negative → Staphylococcus epidermidis

○  2. Coagulase-positive → Staphylococcus

●  F. Coagulase-negative

○  1. Non-mannitol fermenter → Staphylococcus saprophyticus

○  2. Mannitol fermenter → Staphylococcus aureus

●  G. Non-mannitol fermenter

○  1. Gamma hemolytic → Viridans Streptococci

○  2. Non-hemolytic → Diplococci

●  H. Gamma hemolytic

○  1. Optochin-sensitive → Streptococcus Pneumoniae

○  2. Optochin-resistant → Streptococcus Agalactiae

Use these video sources to complete:

https://youtu.be/Cv-R1TT3txQ , 

https://youtu.be/ChEByq75Me0

Transcribed Image Text:

What is a dichotomous key? tool that allows the user to determine the identity of a certain item (like, for example, a tree, a flower, an animal or a simple object) + "Dichotomous" means "divided into two parts". Therefore, dichotomous keys always give two choices in each step. yes Swims Feathers yes no no yes Legs no Duck - Hen -Lizard Snake What is a dichotomous key? tool that allows the user to determine the identity of a certain item (like, for example, a tree, a flower, an animal or a simple object) + "Dichotomous" means "divided into two parts". Therefore, dichotomous keys always give two choices in each step. yes Swims Feathers yes no no yes Legs no Duck - Hen -Lizard Snake