The structure of sharks, perch, and whales are an example of
A. convergent evolution.
B. adaptive radiation.
C. closely related animals.
D. polyploidy.
A. convergent evolution.
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Which of the following tend to increase genetic variation in a population?
A. Gene flow. B. Population bottleneck. C. Nonrandom mating, resulting in inbreeding. D. Mutations, resulting in neutral variation. E. Founder effect, resulting in the decrease in allele frequency and results in inbreeding.
Invertebrates, such as the flatworm, have groups of neurons with a common function. These nerve
clusters are called
a. nerve cords. b. ganglia. c. brains. d. nerve nets. e. radially symmetrical.
Which characteristics best describe earthworms?
a. polychaete; fluid filled coelom b. oligochaete; open circulatory system c. moves by only longitudinal muscle contraction and hydrostatic skeleton d. oligochaete; scavengers; closed circulatory system e. hermaphrodites that fertilize themselves; closed circulatory system
Mutation in master regulators, such as those governing the formation of body segments called _____________ that later develop into bones and skeletal muscles, are usually lethal to the embryo.
A. blastocysts B. somites C. embryonic disks D. amnion E. pharyngeal arches