In some organisms, crossing-over does not occur, and the homologous chromosomes are held together via some other
mechanism. Even though crossing-over leads to genetic diversity, the absence of crossing-over in these organisms does
not prevent the production of diverse gametes. Why is this?
What will be an ideal response?
ANSWER: Independent assortment also leads to genetic diversity, and the more chromosome pairs there
are, the more possible gamete types can be produced even in the absence of crossing-over.
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Refer to the graph above. If the myelin fibers were stripped from this membrane, you would expect the action potential cycle to go
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A) much faster than depicted in the graph.
B) much faster than normal but not peak at 30 mV.
C) slower than depicted in the graph.
D) much slower than normal but peak much higher than 30 mV.
E) none of the above
What respiratory structure produces sound?
a. Pharynx b. Nasal cavity c. Trachea d. Epiglottis e. Larynx
Most of the filtrate is reabsorbed through the walls of the:a
distal convoluted tubule. b. loop of Henle. c. proximal convoluted tubule. d. collecting duct. e. glomerulus
Primary succession may be seen:a
on new lava or on sand dunes. b. after a fire. c. when farmland is abandoned. d. only in tropical rain forests. e. in any community that has periodic disturbances.