In ________ speciation, there is gene flow between populations that are in the process of diverging into two or more species. In ________ speciation, there is no gene flow between populations that are in the process of diverging into two or more species
A. allopatric; sympatric
B. sympatric; allopatric
C. Both allopatric and sympatric are
applicable to either description.
D. Neither allopatric nor sympatric is
applicable to either description.
B
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The only autosomal trisomy in which affected people reach adulthood involves chromosome ________
a. 13 b. 18 c. 21 d. 17
Plasmodesmata are
a. only found in root cells. b. connections between xylem and phloem. c. incapable of structural change. d. able to be opened and closed. e. only found in leaf cells.
The large, rigid layers of Earth's surface that are moving in response to forces deep within Earth, are called
A. petrifactions. B. Wallace's lines. C. radioisotopes. D. paleontologic units. E. tectonic plates.
Which of the following can be defined as a collection of structures involved in emotions and memory?
A) autonomic system B) CNS C) limbic system D) parasympathetic system