evolution

The bones of the forelimbs of the whale, the human and the bat are very similar. This indicates that they all may

• have descended from a common ancestor

• belong to the same species

• have to travel great distances to eat

• had similar environmental pressures

What do we call similar structures that were passed down from a common ancestor?

• vestigal structures

• variable structures

• homologous structures

• fossil structures

The three species pictured share a common ancestor and have adapted so that each lives in a different environment. This is an example of

• Parallel evolution

• Adaptive radiation

• Divergent Evolution

• Convergent Evolution

Small differences of a particular trait

• gene pool

• mutation

• variation

• continental drift

An example of behavioral isolation

• Toads that mate at different times of the year

• Plants that have separate pollination times

• Birds that have specific songs

• Turtles that are separated by a mountain

A gene pool is

• The total number of alleles of the genes that are present in a population of a particular species of organism at a given time

• The condition of a population in which allele and genotype frequencies remain constant from one generation to the next

• The number of phenotypes present in a population of a species at a given time

The environment around Manchester, England, changed during the Industrial Revolution and became very soot-covered. How would this change affect peppered moths (see the two in the photo) living in the area?

• Natural selection favored moths with dark wings because predators could not see them on the soot-colored trees.

• Natural selection favored moths with white wings that were easy for predators to see.

• Natural selection favored moths with white wings because predators could not see them on the soot-colored trees.

• Natural selection caused moths with white wings to become extinct.

Genetic drift is more likely to happen in...

• aquatic populations

• small populations

• terrestrial populations

• older populations

Genetic drift is change in the allele frequency of a population due to...

• random chance

• natural selection

• non-random mating (sexual selection)

• artificial selection

This mechanism of evolution occurs when populations migrate.

• Mutations

• Gene flow

• Genetic drift

• Natural Selection