Click the INTRODUCTION Tab

Evolution Tutorial

Directions: Print this answer sheet. Using the website indicated. Read and answer the following instructions.

Click the INTRODUCTION tab.

1. Evolution refers to modifications, or ______, which eventually result in the formation of ______.

1. What does evolved mean? ______

1. What does extinct mean? ______

1. How do we know that millions of organisms that lived in the past have gone extinct? ______

1. The American cougar and the African lion both share a common ______from the past.

1. Are all cat species related? ______Why? ______

1. Evolution works because is takes an existing structure and ______that structure.

Click the GENES tab.

1. New individuals born in a ______can potentially inherit any of the genes in the ______.

1. Gene frequency refers to how frequent a ______or ______is in a population.

1. Gene frequency can change because of ______. When the gene ______changes the population is ______.

1. Gene flow occurs when genes are able to move from ______.

1. If gene flow stops, isolated populations may change enough that they can no longer ______of the ______.

1. What is speciation? ______

1. If two populations are separated for a VERY long time, and then the two populations are later brought together, they MAY have changed so much that they can no longer ______.

1. Why do you think the arctic fox has thick fur? ______

1. Why do you think the Gray Fox developed thin fur? ______

Click the NATURAL SELECTION tab.

1. Natural selection works because nature selects ______that are the best for a given ______.

1. What does traits mean? ______.

1. Artificial selection is not caused by nature, it is cause by ______.

1. What is the first principle of Natural Selection ______?

1. Why do organisms produce more offspring than needed? ______

1. What is the second principle of Natural Selection ______?

1. Why is variation important? ______

1. What is the third principle of Natural Selection ______.

1. Why is there competition within a species? ______

1. What is the fourth principle of Natural Selection ______

1. What does fitness not mean? ______

1. Why does fitness mean? ______

Click the MUTATION tab.

1. What is a mutation ? ______

1. Are mutations usually beneficial? ______

1. Mutations are the source of ______in a ______.

1. ______will weed out ______mutations and select for ______mutations.

1. Why does the red bug eventually thrive? ______

1. In this example: The ______of the red allele is ______. A change in ______is ______.

1. The ______for white fur made it possible for the ______of the polar bear.

1. What causes sickle cell anemia? ______

1. What does it do to the red blood cell? ______

1. Why is the relationship of sickle cell allele and malaria? ______

1. Since malaria is wide-spread in Africa, is there a natural selection process occurring in relationship to the sickle cell allele? Explain. ______

Click the ADAPTATIONS tab.

1. Natural selection will favor ______that will be ______.

1. According to the text, mammals evolved from ______. The teeth of mammals are more ______than the teeth of reptiles.

Click the PHYLOGENY tab

1. What is phylogeny? ______.

1. How are these relationships expressed? ______.

1. All Arthropods have ______joints and a ______body.

1. Which class of animals is the most successful? ______

1. How is the reptile brain and the mammal brain different? ______

1. What is the significance of Cynognathus? ______

1. How many species of mammals are there? ______

1. The wings of the bird are ______to the front legs of a reptile.

1. The body of a reptile is covered with scales. A bird has scales only on the ______. Both animals have ______. Reptiles have claws on all four legs while birds only have claws on their ______.

1. What is the significance of Archeopteryx? ______

1. How many species birds are there? ______

1. Can they all fly? ______Name one: ______

Click Quiz Questions

Answer QUIZQUESTIONS 1-12 in full sentences on a separate sheet of paper.