Which of the following does NOT cause changes in allele frequencies?
a. genetic drift
b. mutation
c. natural selection
d. gene flow from migration
e. random mating
E
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Answer the following statements true (T) or false (F)
1. Meiosis does not occur in gametophytes. 2. Although land plants, mosses are still tied to water because of their flagellated sperm. 3. The conspicuous green patches of mosses that you see in the woods are mostly sporophytes. 4. The conspicuous green parts of ferns that you see in the woods are mostly sporophytes. 5. Woody plants and herbaceous plants are the two major monophyletic clades of the seed plants.
The hormone that is the basis of most pregnancy tests is
A. follicle-stimulating hormone. B. luteinizing hormone. C. human chorionic gonadotropin. D. estrogen. E. progesterone.
The p53 gene is a tumor-suppressing gene that prevents damaged cells from undergoing cell division. If this gene ceases to function due to a mutation, what will happen to the cell?
A) Tumors will be suppressed. B) The cell will die. C) Uncontrolled cell division will occur. D) The cell will be prevented from undergoing division.
A signal transduction pathway is initiated when a _____ binds to a receptor.
-G protein -signal molecule -calmodulin -tyrosine kinase -cyclic AMP