The growth of a new plant on the margin of a leaf that eventually falls to the ground and grows independently is an
example of ____.
a. fragmentation
b. protoplast fusion
c. somaclonal selection
d. grafting
e. apomixes
ANSWER: a
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What is the biological significance of genetic diversity between populations?
A) Genes for traits conferring an advantage to local conditions make microevolution possible. B) The population that is most fit would survive by competitive exclusion. C) Genetic diversity allows for species stability by preventing speciation. D) Isolated populations become more fit. E) Diseases and parasites are not spread between separated populations.
In Caenorhabditis elegans vulval development, the fate of the progenitor cells is dependent on their proximity to the ____ cell, which secretes epidermal growth factor
Fill in the blank with the appropriate word.
A black bear population being fragmented into
separate smaller populations by a newly constructed road and the smaller populations prevented from interacting is an example of
a. behavioral isolation. b. temporal isolation. c. ecological isolation. d. mechanical isolation. e. genetic isolation
Which of the following statements about plant cytokinesis is true?
a. It begins when telophase ends. b. A division furrow completely separates the cytoplasm. c. It is under the control of Ca2+. d. Vesicles fuse to form a cell plate. e. The spindle fibers break down to form a cell plate.