What do these forelimbs illustrate?

Homologous Structures

Analogous Structures may have similar appearance and function, but are not derived from a common ancestor

Analogous structures DO NOT indicate common ancestry.

Similarities in DNA or protein sequences are called:

Molecular Homologies

The study of the geographic distribution of organisms is called: In 1915 the German geologist Alfred Wegener was struck by the fact that identical fossil plants and animals had been discovered on opposite sides of the Atlantic. Since the ocean was too far for them to have traversed on their own, Wegener proposed that the continents had once been connected.

Biogeography

The appendix is an example of… A comparison of the appendix in a rabbit (left), fetal human (middle) and adult human (right).

Vestigial structures

This picture illustrates….

Homologous structures

Homologous or Analogous? 4-chambered heart 3-chambered heart 4-chambered heart

Homologous or Analogous?

Analogous (the common ancestor did not have wings)

Homologous or Analogous?

Homologous Each leaf has a very different shape and function, yet all are homologous structures, derived from a common ancestral form.

What kind of structures?

Vestigial

Who warned that human overpopulation would lead to a struggle for resources, disease, and starvation?

Thomas Malthus

Term that is a measure of an individual’s survival and reproductive success.

Fitness

Lamark’s Principle of ________ states that changes that occur to an individual in its lifetime can be passed on to offspring.

Acquired Traits

A dairy farmer uses ____________ when he chooses to breed the cows that produce the most milk.

Artificial Selection