Tumor cells arise from normal body cells after a series of cellular “mistakes” disrupts the controls over, and processes of, mitosis and cytokinesis. Describe two errors that might happen during the processes of mitosis and/or cytokinesis and that would produce a daughter cell with “extra” chromosomes.
What will be an ideal response?
Nondisjunction can occur in which one daughter cell receives both chromatids and the other daughter cell receives none: result could be trisomy 21 or 18 (Down’s Syndrome or Edward’s Syndrome).
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In the figure above, which number would designate the biome with the highest variation in annual precipitation?
A) 1 B) 2 C) 3 D) 4
Assume brown eyes is completely dominant to blue eyes and this trait is controlled by a single gene. If
400 people in a population of 10,000 have blue eyes, how many people would be expected to be heterozygous for this trait? (Hint: use the Hardy-Weinberg formula) A. 800 B. 540 C. 320 D. 960 E. It is not possible to determine with the information provided.
Which element is a micronutrient in plants?
a. chlorine b. hydrogen c. potassium d. calcium e. magnesium
Which of the following factors has an effect on the quality of soil resources?
a) plowing b) deforestation c) desertification d) all of the other choices