Which level of organization includes all others?
A. cell
B. tissue
C. organ
D. organism
E. population
E. population
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The differences in inherited traits among individuals in a population are called _______
A. species variation B. genetic mutations C. genetic variation D. natural selection E. None of these
Visual accommodation involves the ability to ____
a. change the sensitivity of the rods and cones by means of neurotransmitters b. change the position of the retina c. change the thickness of the lens by contracting or relaxing certain muscles d. protect the eyeball from foreign matter e. prevent eye strain
A chemical called endogenous pyrogen may be released from lymphocytes that are responding to a pathogen. What does this compound cause?
A. Fever B. Activation of NK cells C. Antibody production D. Inflammation
Imagine that two men and two women settle on an uninhabited island, no new settlers arrive, and nobody leaves the island for many generations. All four of the settlers have brown eyes, but one of the men carries a recessive gene for blue eyes
Eye color has no effect on fitness. If the percentage of blue-eyed individuals on the island increases from 0% to 25%, what is the probable cause? A) Random mutation B) Natural selection C) Genetic drift D) Artificial selection