Biology I: Form and Function

Mr. Nettles

Today’s Agenda: Thurs. Dec. 1, 2011

Warm-Up: Finish up Summarizations (Due Today)

Lesson: Form and Function Lecture

Today’s Objectives:

I will define: evolution, form, function, comparative anatomy, homologous structure, analogous structure, and vestigial structure.

I will recognize the relationship between form and function in living things.

What is Evolution?

Evolution is the process by which species change over time.

Form vs. Function

Form is the visual appearance and configuration of an organism.

Function is any type of life process carried out by an organism.

Comparative Anatomy

Comparative Anatomy is a method by which scientist study the physical features and body parts of different animals to discover how they are related or similar.

Homologous Structures

Homologous Structures are structures that have similar form but different functions.

These structures look alike in some ways, but they do different things.

Homologous Structures

Analogous Structures

Analogous Structures are structures that have similar function but different forms.

These structures do the same thing, but they look different.

Analogous Structures

Vestigial Structures

Vestigial Structures are structures that don’t play a role in the way an organism functions.

They are body parts that don’t really do much work in the body.

Vestigial Structures