When a disease is said to have a multifactorial basis, it means that
A) many factors, both genetic and environmental, contribute to the disease.
B) it is caused by a gene with a large number of alleles.
C) it affects a large number of people.
D) it has many different symptoms.
E) it tends to skip a generation.
Ans: A) many factors, both genetic and environmental, contribute to the disease.
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Which of the following processes generates a continuum (spectrum) of varying phenotypes?
A. Incomplete dominance B. Single-gene traits C. Multiple alleles D. Polygenic inheritance
Which of the following is true of incomplete penetrance?
A. Environmental factors do not influence penetrance. B. Incomplete penetrance implies that some individuals will experience less severe forms of disease such as cancer or Alzheimer's. C. Gene interactions have been shown to result in incomplete penetrance in some cases. D. Incomplete penetrance refers to cases in which individuals developing a particular disease (e.g., cancer or Alzheimer's) lack the typical genotype for this disease.
Ecosystem
What will be an ideal response?
Which process is represented by Figure 12.1?
A. mitosis B. meiosis C. cytokinesis D. schizogony E. budding