THE EFFECTS OF. INBREEDING AND SELECTION 
ON THE FERTILITY, VIGOR AND SEX RATIO 
OF DROSOPHILA AMPELOPHILA 
W. J. MOENKHAUS 
Indiana University, Bloomington, Indiana 
CONTENTS 
MAA EEOMUCLORY | Wie Nae Tet nitoct asd yf 6.0 athip «Hue acne hee ae RO eg MO Ee 124 
Mia etralpAncamlGunOdS eye v2): s.\.c ccs stl se «at A Nein sclecn doe Ol SEO eee eee s 124 
Inbreeding and selection on fertility and vigor.................0eceeeeeeeee- 126 
pla TCC UL CT OTN ene ena, So cle cs cis.broct « Gals ae, odo Ree Crete Deere Shere 126 
2)" {SHEVA gia Nee Ae ae mR dere e Ays inn RCs Siti ecs 127 
a @haracien or ther sterility i: 2 6s .0/s cigs. ve ote sete dene = oreo meee 2 127 
GP DCMECOM Ole SUOETTUY Sch Cs ce. c tre 5 sie «sts dow 0 ee eh renee aot ne cece ee 128 
1G Ol oWRee Vey ato VGLN1a 1°20) Oe A ee ems oc oo Dente eiclc 131 
he Hever Aaa LaVe histel SUNK) Oe Gan 7 ens bien Sc aredc aac 134 
IDISCHASIONa OleRESULUS cc. co coe05...< 4 sco 2 @, ove ciRpe oie act eene ein cee Remetet ors oe 138 
Dex Vad O AMOUSELECTION Serko ohices, uc winies aovin's nlbadae = AE a ea tee 141 
PLC LOCUCLOL Ys. pit iie ote «= cicled. = 4 s/s Je 3 shy cs Semen epee eterno 141 
Dee LReStOrmMalWesex-TAUIOnds. ¢ oe). as <a. 84s sjse wen ees ee leone otahist ero 141 
a, Control of sex-ratio by selection... . 6... 2 oc.ac+s son emeyr aman aeaeee 142 
GREISCOEY Of SULA Q005, 155 5.5. lie lb > sos ietans wipes oe etree ane cneier meee wie 143 
PREStOry. OF (STAM AUG mc. 2 %.5 cf-uk< Ok aeicuatels Gate ot seem as. as te eeaternestotay 147 
EMIDISCHISHI OMe Perce calciaie 9 steko te 5 Pe oP hea Seated ice che 147 
Influence of male and female in determining the sex-ratio.......... 148 
IDisScussionkoleresUlissONWSeX=CaAtlOl a... foes eters cee 151 
SiimamisryehOmeeh Sete Bett Su... Se Raver Do 0, ae a he ee 153 
Tniiersbur eecivedieaniearers cee sc hax 22 = cetera Tee cle tine ne et ee ERR! teen Srcvonsyen en tae 154 
