A field of wildflowers contains approximately equal numbers of red, yellow, and white flowers. A fire moves through the field and kills most of the red and yellow flowers, but leaves a small population of white flowers undisturbed. The following year, most of the flowers that grow in the field are white. Which process has resulted in the random change in the genetic makeup of the flower population?
A) gene flow
B) stabilizing selection
C) genetic drift
D) directional selection
Ans: C) genetic drift
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covalent bonds? a. Atoms share electrons. b. Molecules may possess many covalent bonds. c. Water contains polar covalent bonds. d. Covalent bonds may be "double bonds." e. In polar covalent bonds, electrons are shared equally
A symptom of a transmissible spongiform encephalopathy (TSE) is:
a. degeneration of the digestive tract. b. progressive immune deficiency. c. degeneration of the brain and central nervous system. d. inflammation of the reproductive organs. e. influenza-like symptoms
The spindle is
A. the network of protein cables that will pull the chromatids to opposite ends of the cell. B. the new cell membrane as it reforms across the cytoplasm during cytokinesis. C. the protein that connects the duplicated chromosomes. D. the protein that DNA winds itself around.
What is the first step in genetic recombination?
a) the introduction of single- stranded breaks in aligned DNA molecules b) the exchange of pieces of DNA between homologous chromosomes c) the accurate alignment of DNA molecules d) the introduction of double -stranded breaks in aligned DNA molecules e) lengthening of the chromosomes