Figure 22.18
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Refer to the above figure for questions.
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Which numbered item in the above figure represents a female gametophyte?
A. 1
B. 2
C. 3
D. 4
E. 5
Answer: B
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Which of the following is NOT an accomplishment of Louis Pasteur?
A) determined that the alcohol-making process was mediated by microbial fermentation and thus refuted the theory of spontaneous generation B) developed enrichment culture techniques C) developed heat sterilization techniques that involved the creation of a specialized swan-necked flask D) developed the first rabies vaccine and treated thousands of individuals
Observed genotypic frequencies in populations rarely match Hardy-Weinberg expectations exactly
Why is this so, and how do scientists determine if the frequencies they observe depart from the Hardy-Weinberg equilibrium to a biologically meaningful degree?
In the studies by David Tilman of the University of Minnesota and John Downing of the University of Iowa, reported
in the journal Nature in 1994, they established and monitored 207 plots of Minnesota grasslands for seven years. During the study period, Minnesota's worst drought in 50 years occurred (1987-1988). The ecologists found that those plots with the greatest number of plant species lost ____ ground cover, as measured by dry weight, and recovered faster than species-poor plots. a. less b. more c. no detectable d. only deciduous e. detectable
Which of the following possibilities is the best indicator of an organism's evolutionary fitness?
A) the number of gametes it produces during the years when it is likely to be reproducing B) the number of offspring it produces over its lifetime that survive to breed. C) the number of offspring it produces over its lifetime D) the number of eggs it produces over its lifetime