Which of the following is true of genes and alleles?
A. Alleles only exist on sex chromosomes, whereas genes exist on all chromosomes.
B. Some genes have no alleles.
C. There are only two possible alleles for each gene.
D. There may be hundreds of possible alleles for some genes.
Answer: D
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Lee's first history exam score is +2 standard deviations from the mean in a normal distribution. The test has a mean of 65 and a standard deviation of 5 . Lee's percentile rank would be approximately:
a. 97.5%. b. 65%. c. 75%. d. none of the above.
Pressure occurs when
a. a shock happens unpredictably. b. one must choose between two events. c. a shock happens regularly. d. activities are speeded up or extra work is added.
Many emerging adults take classes in ethnic studies at their colleges to
learn about cultures different from their own. learn about their own culture. prepare for world travel. better understand globalization.
Elizabeth is nursing her newborn daughter, and holds the baby up to her breast. When she strokes her baby's cheek, the child turns her head toward the breast and finds her mother's nipple. This is a demonstration of the __________ reflex
A) rooting B) suckling C) Moro D) grasping