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.

Biology & Microbiology

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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?

Biology & Microbiology

In the United States, the largest group of endangered species is:

a. mammals. b. flowering plants. c. insects. d. birds. e. amphibians

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Why do powerful antibiotics not always remove the cause of meningitis if the disease is caused by Neisseria meningitidis?

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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.

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