The fruit of the mistletoe, a parasitic angiosperm, is a one-seeded berry
In members of the genus Viscum, the outside of the seed is viscous (sticky), which permits the seed to adhere to surfaces such as the branches of host plants or the beaks of birds. What should be expected of the fruit if the viscosity of Viscum seeds is primarily an adaptation for dispersal rather than an adaptation for infecting host plant tissues? It should ______. A) be drab in color
B) be colored so as to provide it with camouflage
C) be nutritious to the dispersing organisms
D) secrete enzymes that can digest bark
C
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Which of the following is NOT a source of
heritable variation in traits among individuals of a population?
a. mutation b. crossing over c. independent assortment d. fertilization e. mitosis
What is meant by the term chiasma?
What will be an ideal response?
_____ can cause genes to move from one linkage group to another.
A. Crossing over B. Inversions C. Translocations D. Polyploidy E. Deletions
At the breakfast table, your roommate says, "Oops! I forgot to take my melatonin last night. I'd better take it now." How do you respond?
A. "Don't take it after a meal - it promotes the 'fight-or-flight' response, not 'rest-and-digest'." B. "Good idea - you don't want your bones to get brittle." C. "Don't take it now - it regulates biological rhythms, and is normally high at night and low during the day." D. "Be sure not to take too much, or your blood sugar could get dangerously low."