Evidence of Evolution

Homologous and Analogous

100

What are homologous structures?

Body parts of organisms that are similar in structure and position, but different in function.

200

What is an Analogous structure?

Body parts of organisms that perform a similar function but differ in structure.

300

The wings of a butterfly and the wings of an eagle are an example of:

Analogous Structures

400

The leg of a cat and the wing of a bird are an example of:

Homologous Structures 

500

Do homologous or analogous structures give us more evidence about two species sharing a common ancestor?

homologous

Embryology

100

What is embryology?

The science of the development of embryos from fertilization to birth.

200

What is an embryo?

An unborn or unhatched offspring in the process of development.

300

All humans have tails as embryos. What do these tails develop into before we are born?

Our tailbone

400

All humans have gills as embryos. What do these gills develop into before we are born?

Our jaw line

500

How can embryos be used as evidence of a common ancestor between organisms?

Evidence of common anatomy in embryos suggests that they inherited the genes for that anatomy from a common ancestor