214 Basis of Sex Determination 



anything to do with hermaphroditism there must be an 

 undiscovered element in the chromosomes which may 

 explain why the female as well as the hermaphrodite 

 have the same chromosome constitution; or we are 

 forced to look for another determinant outside the X 

 chromosomes or the chromosomes altogether. This 

 seems to be the only cytological work on the problem of 

 hermaphroditism. Experimental work has been begun 

 by Correns 1 and by Shull on the determination of 

 hermaphroditism in plants but lack of space forbids us 

 to give details. 



II. The Physiological Basis 6f Sex Determination 



5. As stated at the beginning of this chapter, the 

 chromosome theory of sex determination explained 

 only one feature of the problem, namely, the relative 

 numbers in which both sexes or only one sex, as the case 

 may be, are produced ; and in this respect the evidence is 

 so complete that we must accept it. But with all this, 

 the problem of sex determination is not exhausted, 

 since a physiological solution of the problem of sex 

 determination demands an account of how the sex 

 chromosomes can induce the formation not only of 

 ovaries and testes but also of the other sex characters. 

 For the solution of this problem biology will have to 

 depend largely on experiments in which it is possible 



1 Correns, C, Biol. Centralbl., 1916, xxxvi., 12. 



