Bio 172: Lectures 1 + 2

Covers Animal Distinctives, Body Plans, and the beginnings of the Phylogenetic Tree

5 Generally Visible Characteristics of Animals

1. Multicellularity

2. Heterotrophic Metabolism

3. Internal Digestion

4. Movement

5. Nervous System

Phylogenetic Tree

A diagram that illustrates common ancestry throughout evolution.

Hox Genes

Genes that regulate pattern and axis formation.

Choanoflagellate

A colonial flagellated protist hypothesized to be the closest living relatives of animals.

Cleavage Patterns

The first few divisions of a zygote