Geological evidence reveals that the barrier islands, where the populations of oldfield mice shown in the fig-ure above occur, formed only 6,000 years ago
Presumably, divergence in coat color has occurred since that time (Hoekstra et al. 2006). This is a very short time on the scale of evolutionary time. Explain how these dramatic variations in coat color between popula-tions could have occurred over such a relatively short time span.
What will be an ideal response?
ANS:
Will vary, but should include an explanation that small differences in fitness can translate into large changes in allele frequencies over time.
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Why do powerful antibiotics not always remove the cause of meningitis if the disease is caused by Neisseria meningitidis?
What will be an ideal response?
Tetanus is:
A. a muscle contraction of sustained force. B. a contraction caused by a single action potential. C. an abnormal muscle contraction. D. a contraction where the muscle does not change length. E. a contraction that slowly increases in force.
Assume that one counted 67 plaques on a bacterial plate where 0.1 ml of a 10-5 dilution of phage was added to bacterial culture. What is the initial concentration of the undiluted phage?
What will be an ideal response?
In the United States, the largest group of endangered species is:
a. mammals. b. flowering plants. c. insects. d. birds. e. amphibians