Changing day length, as well as variations in precipitation and temperature, are environmental cues that exert an
important influence on:
a. the kinds of genes a plant has.
b. the number of mutations that genes undergo.
c. whether a plant is an annual, biennial, or perennial.
d. which genes will be expressed in a plant.
e. whether a plant reproduces sexually or asexually.
d
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Prions consist of proteins and have no apparent nucleic acid genome.
Answer the following statement true (T) or false (F)
You observe variation in the auditory signal that males use to attract females. Which of the following would be true if the signal is an accurate indicator of male quality?
a. The highest-quality males have the most common form of the signal. b. The highest-quality males have the most extreme form of the signal. c. Male quality is unrelated to signal variation. d. Only the highest-quality females prefer the highest-quality males. e. Females will use multiple signals to identify the highest-quality males.
Sometimes, organisms that are not closely related look similar because of
a. convergent evolution b. molecular clocks c. mutations d. reclassification
In a flower, the mature male gametophyte is
a(an)
a. pollen grain. b. germinated pollen grain. c. ovule. d. microspore. e. sperm cell