In Drosophila, an individual female fly was observed to be of the XXY chromosome complement (normal autosomal complement) and to have white eyes as contrasted with the normal red eye color of wild type. The female's mother and father had red eyes. The
mother, however, was heterozygous for the gene for white eyes. Knowing that white eyes are X-linked and recessive, present an explanation for the genetic and chromosomal constitution of the XXY, white-eyed individual.
A) nondisjunction in meiosis I or II in father
B) nondisjunction in meiosis II of the mother
C) nondisjunction in meiosis I of the mother
D) nondisjunction in meiosis I of both the mother and father
E) nondisjunction in meiosis I of the father
Answer: B
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A number of different types of microscopy exist. Each type of microscopy has advantages and disadvantages. Can you identify the microscope that would be most advantageous for the situations below?
a. A cell biologist wishes to visualize the ribosomes of a cell. b. A microbiologist wishes to examine the motility of a bacterium. c. An immunologist wishes to determine if a lymphocyte possesses a certain surface protein. d. A virologist is trying to determine the three-dimensional shape of a virus. e. A pathologist is trying to examine the cytoplasm of a cell for changes that result from viral infection. What will be an ideal response?
The process by which a sperm and an egg are united is called _____________
Fill in the blank(s) with the appropriate word(s)
Which of the following is an example of lag information?
A. Measurement of price sensitivity of customers in a given city B. Measurement of rate of purchasing propensity following exposure to advertising C. Measurement of faulty units in response to a recently implemented inventory method D. None of the answers is correct.