Which of the following statements explains why animals are less likely than plants to speciate by polyploidy?
A) Animals self-fertilize less often than plants, so diploid gametes are less likely to fuse.
B) Animals have better mechanisms for repairing chromosomes than plants have.
C) Animals are more mobile, so they have more effective prezygotic isolating mechanisms.
D) Animals are more mobile, so populations get separated far less often.
E) Animals use a more rigorous form of meiosis than plants, making diploid gametes much more difficult to form.
Answer: A
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Mendel's work was rediscoved in 1900 by which of the following individual(s)?
A. Carl Correns B. Erich von Tschermak C. Hugh de Vries D. All of the answers are correct
In the case of the Fo complex, the "o" refers to the antibiotic ________, to which the structure is sensitive.
Fill in the blank(s) with the appropriate word(s).
What adaptation arose in plants that allowed the uptake of gases without drying out on land?
A. production of a cuticle B. development of stomata C. production of pollen D. development of vascular tissue E. production of lignin
Portion of Figure 21.11
?
Refer to the accompanying figure for questions 26-28.
Which letter points to the stipe?
A. A B. B C. C D. D E. E