The reasons why squamates are a better group for the study of the selective forces responsible for the evolution of viviparity compared to mammals. Given: The evolution of viviparity in different lineages of the lizard Sceloporus living in different temperature ranges is shown in the figure of the phylogenetic tree given below: Introduction: In mammals, viviparity evolved only once in the extant lineages about 100 million years ago. In the squamate reptiles, viviparity is believed to have evolved separately more than 100 times. A phylogenetic tree was constructed to study the evolution of a viviparous mode of reproduction from an oviparous mode, under different temperature ranges for the lizard Sceloporus .

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Chapter 32, Problem 3Q

Summary Introduction

To review:

The reasons why squamates are a better group for the study of the selective forces responsible for the evolution of viviparity compared to mammals.

Given:

The evolution of viviparity in different lineages of the lizard Sceloporus living in different temperature ranges is shown in the figure of the phylogenetic tree given below:

Introduction:

In mammals, viviparity evolved only once in the extant lineages about 100 million years ago. In the squamate reptiles, viviparity is believed to have evolved separately more than 100 times. A phylogenetic tree was constructed to study the evolution of a viviparous mode of reproduction from an oviparous mode, under different temperature ranges for the lizard Sceloporus.

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