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Text fig. B A condensed arrangement showing the morphology of the three 

 critical pairs of chromosomes in the parents of each of the five matings and in 

 their male offspring with the number of individuals in each class. The chromo- 

 somes of the male are presented on the left; those of the female on the right. In 

 mating no. 17, where the form of the chromosomes of the female can only be 

 hypothecated, they are represented in outline. 



467 



