Temporal and behavioral isolation are examples of premating isolating mechanisms. Mechanical isolation, gametic isolation, and hybrid inviability are examples of postmating isolating mechanisms. Premating isolating mechanisms are considered much more
important in keeping closely related species genetically separate than are postmating isolating mechanisms. Do you agree? Why or why not?
What will be an ideal response?
Premating isolating mechanisms are more important because it is a waste of time and energy for a member of one species to mate with another species if the result does not produce viable offspring. Natural selection favors those individuals who can produce more offspring faster, so natural selection favors behaviors that ensure members of a species mate only with others of the same species.
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After the drought of 1977, researchers hypothesized that on the Galàpagos island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus. After the drought of 1977, researchers hypothesized that on the Galápagos island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. A tourist company sets up reliable feeding stations with a variety of bird seeds (different types and sizes) so that tourists can get a better look at the finches. Which of these events is now most likely to occur to finch beaks on this island?
A) evolution of yet larger, deeper beaks over time, until all birds have relatively large, deep beaks B) evolution of smaller, pointier beaks over time, until all birds have relatively small, pointy beaks C) increased variation in beak size and shape over time D) no change in beak size and shape over time
Which of the following correctly lists the approximate number of ATP produced by (i) betaoxidation of a 16-carbon fatty acid, (ii) glycolysis and fermentation of a single glucose, and (iii) aerobic respiration of a single glucose, in that order?
A. 106, 2, 32 B. 75, 10, 25 C. 50, 10, 20 D. 40, 10, 20 E. 100, 1, 10
True or False: A biological clock is a set of molecular mechanisms that cycles on its own and thus keeps a regular rhythm
A. true B. false
Plants benefit from frugivores, which aid in the dispersal of their seeds
Indicate whether the statement is true or false