1. In a three-point testcross, the nonrecombinant progeny are A* B* C* and a b c. The double- crossover progeny are A* B* c and a b C*. Which gene is in the middle and why?

Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter12: Mendel, Genes, And Inheritance
Section12.1: The Beginnings Of Genetics: Mendel’s Garden Peas
Problem 1SB: Two pairs of traits are segregating in a cross. Two parents produce 156 progeny that fall into 4...
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1. In a three-point testcross, the nonrecombinant progeny are A* B* C* and a b c. The double-
crossover progeny are A* B* c and a b C*. Which gene is in the middle and why?
Transcribed Image Text:1. In a three-point testcross, the nonrecombinant progeny are A* B* C* and a b c. The double- crossover progeny are A* B* c and a b C*. Which gene is in the middle and why?
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Q. In a three-point testcross the nonrecombinant progeny are A+B+ C+ and a b c. The double crossover progeny are A+ B+ c and a b c+. Which gene is in the middle and why?

Answer. 

Nonrecombinant progeny: A+ B+ C+ and a b c Double - crossover progeny: A+ B+ c and  a b c+ By comparing both we found out that position the C gene is in the middle.

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