ARE PARTICULAR CHROMOSOMES SEX DETERMINANTS? J 



allo-onie- of the spermatocyte- seem to be repre-eiiied by a pair 

 it' element- similar in all respects to each oilier; there i- no dis- 

 similarity of tin- pair, hence no > on-picuou- behavior different 

 from thai of tin- oih.-r chn>mo-ome- aiitosonies). In other 

 word-, it i- the -iivjene-- of tin- element- niono-ome->, or tlu-ir 

 di-parity in -i/<- and a tivity (idiochromosomes), that may In- a 

 reason why the allo-omr- behave so peculiarly in -permato- 



esis. For the-e \ ariou- con-id, -r.it ion- tin- argument- ot Foot 

 and Strobell a^ain-t ilu- hypotlu-i- .in- u[ \alid, though 

 ihi--c in\ v-iii^ator- .irr quitr rii;ht in -crin^ the IKTI- it\" ot 

 tin- odgenesis. 



i KXJ has entered other arguments against the deter- 

 mination of sex b\ .illo-onic-, an h\pothr-i- thai lu- \\holly 

 II, refers to tlu-ir limited .i urrrm -i-. which -how- tlu i \- 



!(| imi In- imi\er-.il sex-determinants. Then to the oci-ur- 

 reno >ry i-hromo-miH 1 in ilu nesis, paralleling 



lh.it in i he -perm.itoi^-iir-i- <.f (,'rv///rv, he call- particular atten- 

 tion, in-i-tin^ ili.it it i- n- - for the \\'il-"ii-Ste\ en- ihn.ry 

 ill. n sperm-Cells alone -hoiild ha\e .illo-om "In (!ryllns 

 ih. -I.- can bf no talk of .1 -i-x-di-terminini; function, and thereby 

 naluralK al-o not in tlu- other animal- \\ilh 3Ory chn>mo- 



-ollli 



Guthei i ias, however, combated Hnclmer'- opinion 



that the chromatic bod\ in the o.c\t' Iryllus i- a chioino- 



-oine. and -ho\\- that it diltri- from -in h in many detail-. I l 

 also In id- that "the diploid chnniio-ome ^roiip of the male num- 

 ber- Ji. that of tin- female 22 chromo-nm. 'The doctrine 



i ; 



iiiiiidt h.. niiv;lit : 



" ti-'|'!ii>- i lii.'in.niti." ai. liniiilt's 



ity. A- a in. if- i: "Tli lit !" th.it in th<- in- 



nu-t.il".lh arlivity tli.in tin- otlu-r i lirinn 



kin, I ot mrt.it..,li-m." I 



incut "I tlii- I li.-n on p. 415, B ! ""- 



,,,,,.,,,11, mi unit 'iiin-'l ii|) in thi-< 



tini--, I. in .1 lii\.il--iu wiili niin-i-,|iii\-.i],-nt cornp Hut in i';"i. a; 



in 1905, 1 argued that the largei m !"ay \: bival,-nt i-h-ni 



tin- |air that i- r-cp.ii.it'- in tl l'.i> r U1 tu-i-iii in -pcrma- 



togent 



