Mother 



Father 



X 



Daughters 



C;iViViV=t-v^ Y 



Sons 



C;'..'.-!!:_-.tv'.-.'..\ V 



%' 



Figure io. Inheritance of bar-eye when one of the daughters of 

 figure 9 is the mother, while the father has normal eyes. The mother 

 has one of the X-chromosomes that produces bar-eye (outline), one 

 that does not (black), while the father's X is of the type that does 

 not produce bar-eye. Of the daughters, half (a) receive from the 

 mother the chromosome that produces bar-eye; half (b) receive the 

 other chromosome; the former (a) have bar-eyes, the latter (b) do 

 not. Also half the sons (c) receive from the mother the bar-eye 

 chromosome, while the other half (d) do not; the former have bar- 

 eye, the latter normal eye. 



V 



