Many soil fungi take part in a mutualistic relationship with plant roots, known as _____
a. mycelium
b. mycorrhiza
c. mycotoxin
d. lichen
e. hypha
ANSWER: b
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The zoo decides to keep all of Gus and Ida's descendants under zoo conditions for the next 30,000 years. They breed only with each other. You visit the zoo in 30,000 years and see their offspring
Do you expect their offspring, which are alive in 30,000 years, to be identical in genotype and phenotype to Gus and Ida? Keep in mind, polar bears start reproducing when they are between 5 and 10 years old, and adult females give birth to two cubs every 2-3 years. A. Yes, because evolution only occurs in nature. B. Yes, because they had a small population to begin with (only two bears), so there was little genetic variation to start. C. No, because mutation would occur occasionally and there are selective pressures that exist in artificial as well as natural environments. D. Maybeâ€"it depends on mutation rates and strength of selective pressures.
Refer to Figure 13-3. The component labeled B is:
a. DNase.
b. DNA polymerase.
c. RNA primase.
d. RNA polymerase.
e. reverse transcriptase
Which of the following characterizes relatively K-selected populations?
A) offspring with good chances of survival B) many offspring per reproductive episode C) small offspring D) a high intrinsic rate of increase E) early parental reproduction
The hundreds of species of Drosophila in Hawaii exhibit different mating rituals. This isolating mechanism is
A. prezygotic and temporal. B. prezygotic and behavioral. C. prezygotic and geographical. D. prezygotic and ecological. E. postzygotic and mechanical.