Mendel's dihybrid crosses, but not his monohybrid crosses, show that
a. some genes are linked together.
b. the two alleles controlling a trait are divided equally among the gametes.
c. alleles for different traits are inherited independently.
d. one of the pair of alleles is dominant to the other.
e. the crossing of two different homozygous forms will not produce any offspring in the first generation that will
look like either of the parents.
ANSWER: c
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Which of the following statements best describes the gametes of most animals?
a. A sperm is large and motile; an egg is small and nonmotile. b. A sperm is small and nonmotile; an egg is large and motile. c. A sperm is large and nonmotile; an egg is small and motile. d. A sperm is small and motile; an egg is large and nonmotile. e. The sperm and egg are about the same size, but only the sperm is motile.
Germ-free animals are often more susceptible to infections and serious disease than are animals with a typical complement of normal microbiota. Based on this observation, which of the following would be an appropriate conclusion?
A. Normal microbiota are incapable of causing disease B. Normal microbiota stimulate the development of the immune system C. Normal microbiota are parasitic D. Normal microbiota are opportunists E. Normal microbiota provide supplemental nutrition to the host
A floodplain is an area adjacent a stream or river that experiences flooding during periods of high discharge. These ecosystems can be very rich in both quantity and diversity of organisms and can contain up to 1,000 times more species than a river. Many floodplains have been compromised by the construction of levees, pollution, and the draining of wetlands and marshes. A restoration project that focuses its efforts on the removal of levees and the improvement of water quality, is a plan focused on
A. restoration of ecosystem functioning. B. restoration of species.
The systemic condition often associated with severe infections caused by the presence of bacteria in the bloodstream is known as .
a. dyscrasia b. endocarditis c. pericarditis d. sepsis