A botanist studying a plant with geographically separated and morphologically distinct populations wants to know the degree to which the differences between the populations are attributable to genetic factors
Outline a simple experiment she can perform to address this question.
Two classic experimental approaches would be useful here. The first is reciprocal transplant, which involves switching the environments of the plants, for example, by creating test plots in each area and planting seeds or seedlings collected from the other site. The second would be to create a common garden, in which seeds or seedlings of plants from each population are reared under identical conditions, for example, side by side in a greenhouse. Comparison of key morphological traits across the populations will provide a way to estimate heritability of the traits.
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All epithelial cells in the inner lining of the large intestine that are heterozygous for an APC mutation ____
a. are able to control cell division with the second copy of the APC gene b. become cancerous c. require additional mutations in downstream genes to become cancerous d. cause the transition from polyps into colon cancer e. can partially escape control of the cell cycle and lead to the formation of clusters of polyps
Which of the following contributes to nosocomial disease?
A. Susceptible population B. Hospital environment C. Other patients D. Patient's own normal microbiota E. All of the choices are correct.
Gene therapy can best be described as the ____
a. repair of a defect (mutation) in a gene b. insertion of normal genes to act in place of mutant genes c. insertion of human genes into other organisms d. cloning of genes to produce and purify therapeutically useful proteins e. mapping of all human genetic information
The process of transferring genetic information between bacterial cells is accomplished with a transformation factor
called DNA. a. True b. False