· On your own and without assistance, complete this Lab 6 Answer Sheet electronically and submit it via the Assignments Folder by the date listed in the Course Schedule (under Syllabus).
· To conduct your laboratory exercises, use the Laboratory Manual located under Course Content. Read the introduction and the directions for each exercise/experiment carefully before completing the exercises/experiments and answering the questions.
· Save your Lab 6 Answer Sheet in the following format: LastName_Lab6 (e.g., Smith_Lab6).
· You should submit your document as a Word (.doc or .docx) or Rich Text Format (.rtf) file for best compatibility.
- Use the following classifications to determine which organism is least related out of the three. Explain your rationale.
|Table 2: Classifications|
|Classification Level||American Green Tree Frog||European Fire- Bellied Toad||Eastern Newt|
- How has DNA sequencing affected the science of classifying organisms?
- You are on vacation and see an organism that you do not recognize. Discuss what possible steps you can take to classify it.
Exercise 1: Dichotomous Key Practice
A dichotomous key is an identification tool that starts with broad defining characteristics and splits into two options until an organism can be identified. In this exercise, you will identify organisms by their binomial nomenclature using a dichotomous key.
|MaterialsDichotomous Key||Images of Organisms|
- Start by observing organism i (Figure 2). Once you have taken notice of its physical characteristics, use the dichotomous key (Figure 3) to identify the organism.
- Start at number 1 on the key and decide if the organism has feature “1a” or feature “1b”.
- Whichever option you choose, follow the dotted line over to the next step that will state “Go to #”.
- Go to that number and again decide between the two options.
- Eventually you will wind up at a two name scientific name.
- Once you have identified organism i, record your finding in Table 3.
- Repeat Steps 1 – 6 for all of the organisms in the dichotomous key (Figure 3).
|Figure 2:Organisms to be identified|
|Table 3: Dichotomous Key Results|
- What do you notice about the options of each step as they go from number one up?
- How does your answer from Question 1 relate to the Linnaean classification system?