Homologous Structures and Analogous Structures Web Quest

Homology

Traits are inherited by two different organisms from a common ancestor

Convergent Evolution

Process in which two distinct lineages evolve similar characteristics independently of one another

What are tetrapods?

animals with four legs

How are tetrapods similar to one another?

• They are built from many individual bones

• They are all spin-offs of the same basic bone layout; one large bone attached to two other long bones with a branching series of smaller bones on the end.

What are some of the major bones found in all Tetrapods?

• Humerus

• Ulna'

• Radius

• Carpals, Metacarpals, and Phalanges

What does an evolutionary tree depict?

• the relationship (between different species) over much larger periods of time (than a family tree)

Structures / from a / are called /

• inherited

• common ancestor

• homologous structures (homologies)

What is Convergent Evolution?

the development of the same trait in two animals that developed/evolved independently of one another.

Often times, two species face a similar / or /. Evolution may then / both of them in / ways.

• environmental condition

• challenge

• shape

• similar

The criteria used to help decide whether a shared morphological character is likely to be a homology

• Same basic structure (though differently shaped)

• Same relationship to other features

• Same development

Only / traits are evidence of shared /

• homologous

• ancestry