GEL 113 Homework 8 Answer sheet

Study Questions for Chapter 6 - Early History of Amniotes:

Primitive Reptiles

Part I: True or False:

1.F 2.T 3.T 4.T 5.F

Part II: Multiple Choice:

1.B 2.A 3.B 4.D 5.C 6.B 7.D

Part III. Thought questions:

1. A higher vertebrate is one which practices amniotic reproduction.

2.a. Physiology: reptiles are amniotes with no larval stage in their development. Amphibians are non-amniotes with a larval stage which metamorphoses into an adult form.

3. A basal reptile is an organism at the base of the reptile clade (formerly referred to as a "stem reptile"). It is an anapsid with amniotic reproduction, but which shows a mix of reptile and amphibian skeletal characteristics.

4. The three major clades of amniotes are:

Anapsid - no temporal fenestra in skull

Synapsid - a single temporal fenestra on each side of skull below the temple bones