You are working in a research lab on the organism Drosophila melanogaster and you have been given the job of
determining the relative positions of three linked genes for your undergraduate research project. A graduate student in the
lab tells you that gene a is 5.0 centimorgans from gene b, and that gene c is 2.7 centimorgans from gene b. What should
you do to finish mapping these three genes? What are the likely results that may occur, and how would you interpret such
results?
What will be an ideal response?
ANSWER: To complete this task, you should perform crosses that will allow determination of the
recombination frequency between gene a and gene c, which will give the map distance these
genes. There are two likely outcomes: an a-c map distance of about 2.3 centimorgans and an
a-c map distance of about 7.7 centimorgans. The results may not be exactly these values, but
they should be close to one or the other. A result of close to 2.3 centimorgans would indicate
that gene c is between genes a and b, while a result of close to 7.7 centimorgans would
indicate that gene b is between genes a and c.
You might also like to view...
Which of the following occurs in the second stage of the Calvin cycle?
a. An organic molecule is reduced. b. CO2 becomes an organic compound. c. RuBP is formed from G3P. d. Respiration produces CO2.
Organisms that manufactures their own food are known as:
a. secondary consumers b. autotrophs c. primary consumers d. heterotrophs e. herbivores
The minimal inhibitory concentration (MIC) is
A) The lowest concentration of a drug that visibly inhibits growth of the organism B) The lowest concentration of a drug that kills the host C) The lowest concentration of a drug that prevents growth of a particular pathogen D) The lowest concentration of a drug that kills the pathogen
Lipid in plasma membranes that contains an attached carbohydrate chain; assembled in the Golgi apparatus.
What will be an ideal response?