Which phylum of vascular, seed-bearing plants comprises about 80% of all living gymnosperms?
a. Anthophyta
b. Coniferophyta
c. Cycadophyta
d. Ginkgophyta
Ans: b. Coniferophyta
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Certain small towns in the western United States have remained isolated and inbred since their settlement many years ago. Some alleles are more common in these communities as compared to the rest of the population. This effect is known as
A. directional selection. B. artificial selection. C. founder effect. D. Hardy-Weinberg principle. E. disrupting selection.
If you eliminated all sources of calcium (dairy
products, some vegetables) from your diet, the level of which of the following would rise in an attempt to supply calcium stored in your body to the tissues that need it? a. aldosterone b. calcitonin c. mineralocorticoids d. parathyroid hormone e. all of these
Describe how testicular function is controlled by the hypothalamus and anterior pituitary. What will be an ideal response?
Reproductive success of an individual is known as:
A. variation. B. adaptive makeup. C. fitness. D. microevolution. E. macroevolution.