A squirrel living in a park bisected by a busy street passes on a mutation to its offspring that allows them to judge the speed and distance of passing cars more accurately based on the vibration they cause in the ground. Over several generations, the percentage of squirrels expressing this mutation increases equally on both sides of the street. What principle does this demonstrate?
a. founder effect
b. genetic drift
c. microevolution
d. equilibrium
c. microevolution
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The energy-releasing process that occurs in most organisms when oxygen is present is:
(a) alcoholic fermentation. (b) aerobic fermentation. (c) aerobic respiration. (d) adenosine triphosphate.
Cephalization is:
A. embryonic development of the head in advance of the rest of the body B. concentration of the sensory organs on the posterior end of the body C. concentration of the sensory organs on the anterior end of the body D. an evolutionary degeneration of the head as seen in some parasites E. a malformation of the head
Which of the following produces muscle tetanus?
a. low levels of acetylcholine b. high levels of creatine phosphate c. anaerobic metabolism d. repeated stimulations over short periods of times e. decreased levels of calcium
In meiosis, homologous chromosomes separate during
a)prophase I. b)prophase II. c)anaphase I. d)metaphase I. e)anaphase II.