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Concepts of Genetics 11th Edition by William Klug,Michael Cummings,Charlotte Spencer,Michael Palladino
Edition 11ISBN: 9781292139456Concepts of Genetics 11th Edition by William Klug,Michael Cummings,Charlotte Spencer,Michael Palladino
Edition 11ISBN: 9781292139456 Exercise 29
In 1988, Horst Wilkens investigated blind cavefish, comparing them with members of a sibling species with normal vision that are found in a lake [Wilkens, H. (1988). Ecol. Biol. 23: 271-367]. We will call them cavefish and lakefish. Wilkens found that cavefish eyes are about seven times smaller than lakefish eyes. F 1 hybrids have eyes of intermediate size. These data, as well as the F 1 × F 1 cross and those from backcrosses (F 1 × cavefish and F 1 × lakefish), are depicted below. Examine Wilkens's results and respond to the following questions:
(a) Based strictly on the F 1 and F 2 results of Wilkens's initial crosses, what possible explanation concerning the inheritance of eye size seems most feasible?
(b) Based on the results of the F 1 backcross with cavefish, is your explanation supported? Explain.
(c) Based on the results of the F 1 backcross with lakefish, is your explanation supported? Explain.
(d) Wilkens examined about 1000 F 2 progeny and estimated that 6-7 genes are involved in determining eye size. Is the sample size adequate to justify this conclusion? Propose an experimental protocol to test the hypothesis.
(e) A comparison of the embryonic eye in cavefish and lake-fish revealed that both reach approximately 4 mm in diameter. However, lakefish eyes continue to grow, while cavefish eye size is greatly reduced. Speculate on the role of the genes involved in this problem.
![In 1988, Horst Wilkens investigated blind cavefish, comparing them with members of a sibling species with normal vision that are found in a lake [Wilkens, H. (1988). Ecol. Biol. 23: 271-367]. We will call them cavefish and lakefish. Wilkens found that cavefish eyes are about seven times smaller than lakefish eyes. F 1 hybrids have eyes of intermediate size. These data, as well as the F 1 × F 1 cross and those from backcrosses (F 1 × cavefish and F 1 × lakefish), are depicted below. Examine Wilkens's results and respond to the following questions: (a) Based strictly on the F 1 and F 2 results of Wilkens's initial crosses, what possible explanation concerning the inheritance of eye size seems most feasible? (b) Based on the results of the F 1 backcross with cavefish, is your explanation supported? Explain. (c) Based on the results of the F 1 backcross with lakefish, is your explanation supported? Explain. (d) Wilkens examined about 1000 F 2 progeny and estimated that 6-7 genes are involved in determining eye size. Is the sample size adequate to justify this conclusion? Propose an experimental protocol to test the hypothesis. (e) A comparison of the embryonic eye in cavefish and lake-fish revealed that both reach approximately 4 mm in diameter. However, lakefish eyes continue to grow, while cavefish eye size is greatly reduced. Speculate on the role of the genes involved in this problem.](https://d2lvgg3v3hfg70.cloudfront.net/SM1220/11eb563d_4e6a_3886_a8c8_df5838032a90_SM1220_00.jpg)
(a) Based strictly on the F 1 and F 2 results of Wilkens's initial crosses, what possible explanation concerning the inheritance of eye size seems most feasible?
(b) Based on the results of the F 1 backcross with cavefish, is your explanation supported? Explain.
(c) Based on the results of the F 1 backcross with lakefish, is your explanation supported? Explain.
(d) Wilkens examined about 1000 F 2 progeny and estimated that 6-7 genes are involved in determining eye size. Is the sample size adequate to justify this conclusion? Propose an experimental protocol to test the hypothesis.
(e) A comparison of the embryonic eye in cavefish and lake-fish revealed that both reach approximately 4 mm in diameter. However, lakefish eyes continue to grow, while cavefish eye size is greatly reduced. Speculate on the role of the genes involved in this problem.
Explanation
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(a) This is an example of quantitative i...
Concepts of Genetics 11th Edition by William Klug,Michael Cummings,Charlotte Spencer,Michael Palladino
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