A patient with leukemia has blood cells that are not dividing properly and are out of control. Treatment consists of a bone marrow transplant. How would this help?
What will be an ideal response?
Answer: The improperly dividing cells must be destroyed, or they will continue to cause problems. The only way to ensure that all of the leukemia cells are removed is to destroy all of the blood cells. Then a new supply of functioning blood cells has to be implanted to restore the blood cell population. Since the stem cells in the bone marrow give rise to all forms of blood cells, the transplant would replace the defective cells.
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How would the phenotypes of progeny differ if a trait was produced from the influence of many genes, compared to a trait caused by a single gene with two alleles and incomplete dominance?
A. They would not differ, and progeny in both would have an array of phenotypes that vary continuously across a range. B. The progeny from the single-gene cross would all be identical, whereas the manygene cross would vary continuously across a spectrum. C. The progeny from the single-gene cross would have three phenotypes, whereas the progeny of the trait caused by many genes would vary continuously across a spectrum.
What is the major reason that deforestation is difficult to reverse?
a. The soil is too acidic. b. Trees must have shade to grow. c. Landslides become too frequent. d. Soil nutrient loss and drier, hotter conditions make it difficult for seedlings. e. Seeds cannot spread.
A disease that has a steady frequency over time in a particular geographic location is referred to as ________.
A. endemic B. chronic C. pandemic D. sporadic E. epidemic
The explanation of how eukaryotic cells came about is
A. the theory of spontaneous generation. B. the endosymbiotic theory. C. Oparin and Haldane's hypothesis. D. the theory of biogenesis.