A polygenic trait is influenced by the effect of several genes. Although one or more of these may be major genes, many others with lesser effects are known as what type of gene?
What will be an ideal response?
modifier genes
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Proper functioning of the human kidney requires considerable active transport of sodium in the kidney tubules. If these active transport mechanisms were to stop completely, how would urine production be affected?
A. No urine would be produced. B. A lower-than-normal volume of urine which was less concentrated than the blood (hypotonic) would be produced. C. A lower-than-normal volume of urine which was more concentrated than the blood (hypertonic) would be produced. D. A greater-than-normal volume of urine equal in concentration to the blood (isotonic) would be produced. E. A greater-than-normal volume of urine that was more concentrated than the blood (hypertonic) would be produced.
Wilting of a plant occurs ____
a. if the plant is placed in an isotonic solution
b. if there is a rise in turgor pressure c. as a result of facilitated diffusion d. if the plant is placed in a hypertonic solution e. if the plant is placed in a hypotonic solution
Driver mutations provide a growth advantage to a tumor cell. Which type of mutation is known to accumulate in cancer cells but has no direct contribution to the cancer phenotype?
A) induced mutations B) indirect mutations C) carrier mutations D) alteration mutations E) passenger mutations
Answer the following questions true (T) or false (F)
1. Different parts of the tongue are responsive to different tastes. 2. The cilia that respond to sounds in the cochlea have "trapdoor" channels for K+ ions. 3. Our visual system creates images as well as perceiving them.