Biology Evolution Exam 1 Study Guide
Solutions
Evolution - ANSWER1. theory that all organisms are related by common ancestry and due to descent
with modification, changed over time
2. change in genotype/genetic make-up of a population from one generation to the next
What must happen for evolut...
Homology - ANSWER✔✔similar structures or genes because of common ancestor but acquired
differences through evolution
ex. bats, humans, and dogs have same bone structure but used for diff. functions
ex. embryo of chicken, snake, human, and cat look alike during first stage
Molecular Structure - ANSWER✔✔all organisms have same genetic code (because of common ancestor)
with little difference.
-->differences exist due to mutations that are not deleterious and therefore still allow the organism to
function normally.
ex. DNA of mouse and human. Evolution proved because of some change in gene sequence even though
majority are parallel.
Vestigial Traits - ANSWER✔✔phenotypes found in both modern organism and ancestor, but serves no
purpose for modern organism. Natural selection does not act to eliminate it because not harmful to
organism. Evidence for evolution because significant for ancestor, but due to change over time, serves no
function to us
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