X 



CYTOLOGY 



PAGE 



4. Which of the two Divisio7is of the Meiotic Phase effects 



the Sepaj'ation of the Homologous Chromosomes ? . 54 



5, Syfiizesis . . ■ - -54 

 C. Meiosis in the Female . . . . -55 



1. The Co7itmuity of the Ch7'-omosomes . . -59 



2. The Relatioti between the Chromosomes and the Nucleoli 62 



3. The Co7i7iection betwee7i the Ge7'77ii7ial Vesicle a7id Yolk 



For7fiatio7i . . . • • -63 



4. Does any Stage co7)iparable to the Ger77ii7ial Vesicle occur 



i7i Spe7'77iatogenesis ? . . . • -65 



CHAPTER III 



Syngamy, Early Development, Parthenogenesis 



A. The Development of the Spermatozoon 



B. Syngamy 



C. Gonomery 



D. The Germ-Track 



E. Parthenogenesis 



1. Obligatory Parthenoge7iesis 



2. Facultative Parthe7iogenesis 



3. The Ho77iology of the Meiotic Divisions zVz Obligatoij 



a7id Facultative Parthe7ioge7tesis 



4. Artificial Pa7'thenoge7iesis 



67 

 67 



71 



77 



79 

 86 



87 

 91 



94 

 94 



CHAPTER IV 



The Sex Chromosomes . . . . . • 98 



1. The Sex Chr 07710 so7nes in Disects . . .98 



2. Which of the two Meiotic Divisio7is acts as the Reductio7i 



Division for the Sex Chro77ioso77ies? . . .102 



3. Various For7ns of the X a7id Y Chro77ioso7nes . .104 



4. Behaviour of the Sex Chro77iosomes duri7ig Sy72desis and 



the Meiotic Prophase^ a7id outside the Meiotic Phase . 106 



5. Sex Chromoso77ies in Ani7nals other tha7i bisects . 109 



6. Cases where the Differe7itial Sex Chro77Wso7ne is presetit 



in the Fe77iale . . . . .111 



7 . So77ie Special Life Histo7'-ies . . . .113 



8. The Relation betiuee7i the Sex Chroi7ioso77ies and the 



Deter i7ii7iation of Sex . . . .121 



