Systematists use phylogenetic trees to graphically represent hypothesized evolutionary relationships
among organisms.
_____________________ Indicate whether the statement is true or false.
T
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Match the following items with the correct phrases.
_______1. Several dozen people having nausea and diarrhea several hours after a church picnic. _______2. A disease that occurs only every once in a while in a particular geographic region. _______3. A disease that is always present in a particular geographical region. a. endemic disease b. epidemic disease c. pandemic disease d. sporadic disease
Which of the following describes the curve labeled “E” on the graph?
a. a primary response to the initial antigen b. a secondary response to the initial antigen c. a primary response to an antigen distinctly different from the initial antigen d. a secondary response to an antigen distinctly different from the initial antigen e. a tertiary response to the initial antigen
Color is an inherited trait in beetles. If brown beetles move into a population from a nearby island, which of the following statements is correct?
A. Gene flow causes the frequency of the green allele to increase. B. Gene flow causes the frequency of the brown allele to increase. C. Natural selection causes the frequency of the green allele to increase. D. Natural selection causes the frequency of the brown allele to increase. E. This is an example of genetic drift.
The portion of the electromagnetic spectrum visible to the human eye is known as ________.
Fill in the blank(s) with the appropriate word(s).