Describe the ongoing research concerning the relationship between species richness and community stability. What
research supports or fails to support this relationship? What will be an ideal response?
Concepts to Consider: The traditional view supports increasing species richness as a cause
of community stability; experimental and field research supports this view, including: 1)
studies in monocultures such as agricultural areas that are susceptible to disruptions due to
lack of species richness, and 2) studies by Tilman and Downing in Minnesota grasslands;
however, typical community structure does vary from year to year, indicating a natural
variation in species densities. Also note criticisms of this study that suggest using established
ecosystems, rather than plots, in order to avoid additional confounding variables.
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In a dihybrid cross involving two autosomal traits on different chromosomes in which the parents are purebred for the opposite forms of both traits, how many of the offspring would be expected to be homozygous recessive for both traits?
A. 9 out of 16 B. 6 out of 16 C. 1 out of 16 D. 3 out of 16
Free-living flatworms (planaria) move by using
(a) cilia. (b) flagella. (c) pseudopodia. (d) a muscular foot.
Which of the following is an organism that
possesses chaetae and nephridia and exhibits coordinated movements of circular and longitudinal muscle? a. millipede b. tapeworm c. polychaete d. hookworm e. flatworm
Comparative genome studies show that humans and _____________________ shared a common ancestor
approximately 5.4 to 6.3 million years ago. Fill in the blank(s) with the appropriate word(s).