The shared anatomical and behavioral characteristics that reflect common ancestry between birds and crocodiles. Also, explain the reason, for which dinosaurs also shared these traits. Introduction: The diapsid lineage of amniotes is Archosaurs. The living representatives of this class include crocodilians and birds. The extinct members of the group are dinosaurs and pterosaurs. The ancestor for these three members of the group is common. Hence, the probability of some common traits being shared among these members is higher.

Question

The tree shows one lineage of ornithischian dinosaurs and many lineages of theropoddinosaurs. Some important traits are mapped on the tree including the aspects of feathers, digits of thehands and a few behaviors. a. What phylogenetic function do the Ornithischian dinosaurs play in this tree?b. What trait is shared by all theropod dinosaurs?c. Only two lineages are thought to be capable of flight. What trait may have helped their wings to bestrong enough?d. What seems to happen to the bones of the hand across this tree of dinosaurs?e. What other bone characteristics might be important to ultimately enabling flight?

Answer 1

Question

Chapter 32, Problem 14TYK

Summary Introduction

To review:

The shared anatomical and behavioral characteristics that reflect common ancestry between birds and crocodiles. Also, explain the reason, for which dinosaurs also shared these traits.

Introduction:

The diapsid lineage of amniotes is Archosaurs. The living representatives of this class include crocodilians and birds. The extinct members of the group are dinosaurs and pterosaurs. The ancestor for these three members of the group is common. Hence, the probability of some common traits being shared among these members is higher.

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The tree shows one lineage of ornithischian dinosaurs and many lineages of theropoddinosaurs. Some important traits are mapped on the tree including the aspects of feathers, digits of thehands and a few behaviors. a. What phylogenetic function do the Ornithischian dinosaurs play in this tree?b. What trait is shared by all theropod dinosaurs?c. Only two lineages are thought to be capable of flight. What trait may have helped their wings to bestrong enough?d. What seems to happen to the bones of the hand across this tree of dinosaurs?e. What other bone characteristics might be important to ultimately enabling flight?

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