THEORY OF EVOLUTION 



141 



producing sperms, as indicated in the diagram 



(fig. 70). 



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Fig. 70. Scheme showing the results of fertilizing white 

 bearing eggs (4 kinds) resulting from non-disjunction. The 

 upper half of the diagram gives the results when these eggs 

 are fertilized by normal red bearing, female producing sperm, 

 the lower half by normal, male producing sjierm. 



If such an XXY female carried white bear- 

 ing Xs (open X in the figures), and the male 



