A key difference between single-gene traits such as those Mendel studied and complex traits such as human height is that:
A. complex traits are generally uninfluenced
by the environment, whereas single-gene
traits have a significant environmental
component.
B. single-gene traits are generally
uninfluenced by the environment, whereas
complex traits have a significant
environmental component.
C. complex traits show incomplete
dominance, whereas single-gene traits show
simple dominance.
D. single-gene traits show both simple and
incomplete dominance, whereas complex
traits show only simple dominance.
E. None of these choices describe
differences between single-gene and
complex traits.
B
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Which of the following cell types can become the meristematic cells of a vascular cambium? Select all correct choices
A. shoot apical meristem cells B. procambial cells C. epidermal cells D. parenchymal cells
Which of the following statements are true of xylem?
_____ It is found in all land plants. _____ It assists in conducting materials, such as water and minerals, throughout the plant. _____ It provides structural support to the plant. _____ It is found in the gametophyte generation, but not in the sporophyte. _____ It contains specialized cells known as tracheids.
Fossils of plants found in deeper geologic layers do not show vascular tissues, while fossils in shallower geologic layers include some specimens with and some without vascular tissues. Thus, vascular tissue in plants is considered a ____ character.
a. ancestral b. homoplasious c. primitive d. derived e. physiologically essential
Cells in the nervous system that send and receive electrical signals are called ____
a. receptors b. neurons c. sensors d. glial cells e. signal cells