The evolution of initiation of limb development in tetrapods is best explained by
A. a new gene mutation.
B. the modification of an existing gene for a new function.
C. homoplastic convergence.
D. gene duplication and divergence.
E. conserved genes.
B. the modification of an existing gene for a new function.
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In some arthropods tagmatization has produced a combination of head and thorax known as a
A. cephalothorax. B. fused corpora. C. headless mite. D. larval instar. E. thoracotomy.
Imprinting disorders illustrate
A) epistasis. B) epigenetics. C) epidermics. D) apogenetics.
The primary muscle(s) involved in human breathing is/are called the
a. external intercostals. b. internal intercostals. c. diaphragm. d. abdominal wall muscles. e. lung muscles.
How is tuberculosis transmitted?
A) by sexual contact B) by contaminated food C) by sneezes D) by infected blood products