Vol. XIX. June, i 9 io. No. i 



BIOLOGICAL BULLETIN 



ARK PARTICULAR CHROMOSOMES SEX 

 DETERMIN \\ I - 



TMi >S. H. M<).\ I i. 'Ml- KV. 

 Tin- pa-t decade li.i- \\itii' -\\- renewed intere-t in the 



em- "i' sex determination, <lin- \cr\ largely in ilu- -tud\ <>\ 



h\ liridi/atioii and tin- I'mad application of tin- iv-ult-. Con- 

 rurrentK tin- in\ i -i i'catiou <>f tin- cerm cell- h.i- iiuTc.i-i'd in 

 .iinmiiil in .1 crMiiiciric.il IMUM; nc\cr lirtV.rr h.i\-r ilic-c ci-ll- 

 t'iill\ i! '. ihc iliMii-cln- "I" liinln'ci^i-. .ind MUI- knoulcd'cr of 



ill.- coniplcx i lirM m <>-Min.il .t.tixitic- li.i- incn-.i-cd to .111 extent 

 unpredicted. 



In ]>.ii tii ul.tr h.i\c multiplied im 'ii>n- of llic modified 



chromosomes, no\\ de-cril>ed in .niim.iU for the -pcnn 

 in in-eci-, .ir.nic.iil-. m\ rioj | lod.i, S.i^ii l.i .ind hinU: 



and for tli. tiesis in ri liinodrrm-, tin- c.u. and ]io--ilil\ -oinc 



insects /' l ; olli>\viiu ilie tenninol .en 



|i\ me iii i)o(., tlu-r ni.i\ In- collccti\rl\ n. lined .illo-oii, rm 



nion- conxciiicnt than in> earlier oin- of heterc .. hronio-oine-. in 

 contrast to the unmodified chrom<i-omi-- or autosomes I'liry 

 havereceived ; \ariet\- of nam >r\ . -|ic< ial. lac^in.u, 



hcleroiropic, -r\ cliromo-omr-; idiochronio-omr-. microchromo- 

 -ome-. tli|)lo-ome-. gonochromosomes, chromatin nnclcoli, i 

 .\n\ 1'Mtly within a nuclcu- that -tain- like chromatin -hotild not, 

 ho\\c\cr. lie con-idered .m allo-oiiK- until it- chromo-omal nature 

 lie a-ceriaillrd. 



\\ilhin the pa-t cijjit years an h\-]othi--i- ha- ari-cii a-criliini; 

 -cx-drterminin;c |iropertie- to the-e allo-ome-, and m\ ol.jcct U 

 to tre-at thi- lupoihe-i- fir-t hi-toricalK , and st-cond crit icall\'. 



i 



