In a two factor cross, the longest possible map distance is 50 map units.  Explain why this is true.  How then can genetic maps show two genes that are 70 map units or more apart?

Concepts of Biology
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ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:Samantha Fowler, Rebecca Roush, James Wise
Chapter8: Patterns Of Inheritance
Section: Chapter Questions
Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...
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  1. In a two factor cross, the longest possible map distance is 50 map units. 
    1. Explain why this is true. 
    2. How then can genetic maps show two genes that are 70 map units or more apart?
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