( Lab 2.1 Evolutionary Mecha BryteWave: Essentials of Ph Mechanisms of evolution
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( Lab 2.1 Evolutionary Mecha BryteWave: Essentials of Ph Mechanisms of evolution (a Q Evolution Flashcards 1 Qual- oursesasu edu e et ap ps/assessment/take/aund. sp?course assessment id-879001 1 &course;, de 36863 7.1 & content id· 1698004 1&step; rul ASU Home My ASU Colleges & Schools Map QUESTION1 As biologists, we classify organisms based on theirevolutionary history. So, the way to discover how groups of animals are related to each other is to examine the anatomical features of the different organisms. As you know, body parts that are alike in origin and basic structure are called homologous structures. When different organisms share a large number of homologous structures, it is considered strong evidence that they are "related" to each other. What does related mean in this context? It means they must have had a common ancestor at some time in the past. The more homologous traits two organisms share, the more recent their common ancestor lived. To get practice understanding how to use the anatomical characteristics of organisms to understand their evolutionary relationships, we will create a "tree of life" for a few species of animals. Your task is to figure out the evolutionary relationships among them! I have read the above information O I have NOT read the above information QUESTION 2 Click Save and Submit to save and submit. Cick Save All Answers to save all answers 0 DOLLExplanation / Answer
Question 3 :
Answer : frog
Frog has only one homologous character, limbs in the three species, expecting that the characters developed from one species to other, frog goes on branch A
Question 4 :
Answer : lizard
Lizard has an additional homologous character tail, so lizard goes on branch B
Question 5 :
Answer : dog
With the evolution of hair or fur in addition to the limbs & tail dog takes the branch C
Question 6:
Answer : origin of limbs, origin of tails, origin of hair.
In the above example the species evolved by developing additional characters. The development of these additional characters marked the evolution of the species from one to another. Frogs, lizard and dog have limbs. So the first mark in phylogeny will be origin of limbs. Frogs developed tail to evolve into lizards. So the second mark being the origin of tail. Lizards developed hair to evolve into dog leaving origin of hair as the mark of evolution.
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