ARE PARTICULAR CHROMOSOMES SEX DETERMINANT 13 



mo-t \vc are justified in concluding only that the chromosomes 

 have a share in tin- establishment of sex. He would be ra-h who 

 \\-mld \i-nturc I- 1 claim that a particular chromosome determines 



excretion, another determine- locomotion; yet these proces 

 are relatively -imple compared with that of -exuality, which 

 -(.me ha\e contended may 1 .e . ..m rolled by a particular chronio- 

 some. The hypothe-i- i- toonaive.il assumes too great -im- 

 lilicity of the cell, i> trong of rkid predetermination. 



The ide.i of unit character-, promulgated mainly by the work ot 

 Mendel, I >eYrie- and their follower-, i- largely to blame for -uch 

 hypoth. < I ms to me that phy-iological -tudy ha- siilYi- 



rienily demon-ir.ited thai there are no actual unit character-, 

 ami it i- but natural that phy-iologi-t- have refu-ed to accept 

 them. hi the analyst! --breeding, the in\e-tigator ha- 



tn focus hi- attention upon one or but a few i haracteri-t ic- ot 

 the orgaiii-m: he ha- to close lr. to the great multitude ..( 



Characteristics, for the\ ., numer>u- for an\ one mind to 



p ,ii once. The i ha- he m,i\ -elect lor examination 



are hi- unit- of -tud\ , and he i- en ti rely jn- titled in -peaking ol 

 them as unit characters, provided he doe- not that they 



are merelj .ubinai\ units of convenience, lint mo-i h\ bridi-t- 



ha\e ^oiie further t han t hi- : t he\ have SOUght to directl) compare 

 SUCh arbitral |.t- \\ith unit- of or-aiii/alion. scarcely |>an- 



in- i.i coii-ider uhat i- a unit of oixani/ation. s u n-ly it i- the 

 mi-m as a \\lmU- that i- the miU unit, and ju-t a- -uiel\ all 

 it- part- are mo-t coni].le\l\ interrelated. The lixin^ l"'d\ i- a 

 linitN . not a colon\ . 



Modern Meiuleli.ui explanation- repre-eiit a determinant 

 theoi\ far mor< i and complex than that of \Vei-maiin, 



lhoiii;h, -iran^eU enough. m-t M-ideli-t- in the iniTption ot 

 their -tudie- \\etv im-\ ni|)athetic to \\ ei-mannian interpretation. 

 Thi- i- the mo-t curioii- in-tance of h'\\ men ha\e come to 

 identif\ an arbiiiarx term of convenience \\ith a part of the 



When Sutton i.,o.V |'ointe<l out that the paternal and mater- 

 nal chromosome series parallel in their pairing and -cparation 

 phenomena of alteruati\e inheritance, thu- -eeining to ptv-cnt a 

 cellular ba-i- for Mendcli-m. and Castle (IQO3) argued that sex 



