Which type of chromosomal change occurs when a chromosome breaks and the broken part attaches to a different chromosome?
a. Inversion
b. Duplication
c. Translocation
d. Deletion
e. None of these choices.
c
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The portion of the biosphere that is composed of any
form of water is the a. atmosphere. b. lithosphere. c. geosphere. d. hydrosphere. e. thermosphere.
As a researcher, you are charged with determining the side effects of a new drug. From previous observations, you
suspect that this drug reduces the rate of DNA production (replication) within skin cells of patients using the drug. With the following materials, design an experiment that would answer your questions about the effect of the drug on DNA production. You know that: DNA contains phosphate groups. You have: radioactive isotopes of phosphate (32P), skin cell cultures from various patients, the drug in question, and a device that measures radioactivity. What will be an ideal response?
In general, in a population in which a trait is exposed to stabilizing selection over time:
a) the mean increases and variation decreases. b) the mean increases and variation increases. c) the mean stays approximately the same and the variation decreases. d) the mean changes and the variation decreases. e) the mean stays approximately the same and the variation increases.
Sexual reproduction in the cellular slime mold Dictyostelium discoideum involves the production of special spores called ________.
A. amoeba flagellates B. macrocysts C. discoidia D. sporozoites