BIO153H5 Lecture Notes - Lecture 4: Cladistics, Paraphyly, Lacrimal Bone
Document Summary
Ruth hufbauer on rescuing populations from extinction using demographic inputs. All information is on the bio153 library link in portal. Don"t have to rewrite the questions, just indicate which question is being answered ie: question 1a), question 3c), etc. Answers should be in full sentences but not full paragraphs. Are feathers a derived or an ancestral characteristic when you compare: Both songbirds and ducks have feathers, so it is a shared characteristic. Since both have it, the ancestor most likely also had feathers. If the ancestor didn"t have feathers, it had to evolve twice. If it had feathers, it only had to evolve once. The more simple tree is assumed to be the more likely, so feathers are ancestral. Birds have feathers, but the reptilian ancestor did not. Therefore, it had to have been a derived trait. Bear is the most distant relation - the only one with a lacrimal bone.
