Disruptive selection operates whenever:
A) the extremes in a distribution of phenotypes are more fit than the average.
B) a phenotype is more successful because it is rare.
C) natural selection is disrupted by genetic drift.
D) only the largest individuals survive.
Answer: A
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Two species of frog mate in the same pond. One breeds in early summer and one in late summer. This is an example of what kind of reproductive isolation?
A. pre-zygotic, behavioral isolation B. pre-zygotic, temporal separation C. pre-zygotic, ecological separation D. post-zygotic, temporal separation E. post-zygotic, ecological separation
You are investigating cell localization by targeting the carbohydrates associated with various cell types. Based on this molecule's ability to bind various carbohydrates, which of the following would help determine which carbohydrates are found on the cell surface?
A) cadherins B) proteoglycans C) pectins D) connexins E) lectins
Which of the following might a genetic counselor do as part of her job?
A) Order prenatal tests, interpret the results, and then deliver the baby B) Order a lipid profile, interpret the results, then prescribe a statin drug if cholesterol levels are unhealthy C) Require a patient to take a test for hereditary colon cancer D) Explain the inheritance of a specific disorder in a family, evaluate risks for relatives, and advise on genetic testing
Women taking birth control pills are more likely to have ________
A) babies B) decreased blood pressure C) increased STDs D) fewer abnormal blood clots