Studies in Spermatogenesis

Studies in Spermatogenesis
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Studies in Spermatogenesis is a two part monograph written by American geneticist Nettie Maria Stevens which highlighted her increasingly promising focus of sex-determination studies and chromosomal inheritance. She observed that male mealworms produced two kinds of sperm, one with a large chromosome and one with a small chromosome. When the sperm with the large chromosome fertilized eggs, they produced female offspring, and when the sperm with the small chromosome fertilized eggs, they produced male offspring. The pair of sex chromosomes that she studied later became known as the X and Y chromosomes.

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N. M. Stevens. Studies in Spermatogenesis

Studies in Spermatogenesis

Table of Contents

Volume 1

Table of Contents

STUDIES IN SPERMATOGENESIS WITH ESPECIAL REFERENCE TO THE "ACCESSORY CHROMOSOME."

By N. M. Stevens

METHODS

RESULTS OF INVESTIGATIONS

Termopsis angusticollis

Stenopelmatus

Blattella germanica

Tenebrio molitor

Aphis œnotherae

Sagitta bipunctata

GENERAL DISCUSSION

THE "ACCESSORY CHROMOSOME."

BIBLIOGRAPHY

DESCRIPTION OF PLATES

Plate I. Termopsis angusticollis

Plate II. Stenopelmatus

Plate III. Stenopelmatus

Blattella germanica

Plate IV. Blattella germanica

Plate V. Blattella germanica

Plate VI. Tenebrio molitor

Plate VII. Aphis oenotherae

Sagitta bipunctata

Volume 2

Table of Contents

INTRODUCTION

METHODS

COLEOPTERA

Trirhabda virgata (Family Chrysomelidæ)

Trirhabda canadense

Chelymorpha argus (Family Chrysomelidæ)

Odontota dorsalis (Family Chrysomelidæ)

Epilachna borealis (Family Coccinellidæ)

Euphoria inda (Family Scarabæidæ)

Blepharida rhois (Family Chrysomelidæ)

Silpha americana (Family Silphidæ)

Doryphora decemlineata (Family Chrysomelidæ)

Miscellaneous Coleoptera

HEMIPTERA HOMOPTERA

Aphrophora quadrangularis

LEPIDOPTERA

Cacoecia and Euvanessa

SUMMARY OF RESULTS

FOOTNOTES:

COMPARISON OF RESULTS IN DIFFERENT SPECIES OF COLEOPTERA

COMPARISON OF THE COLEOPTERA WITH THE HEMIPTERA AND LEPIDOPTERA

GENERAL DISCUSSION

FOOTNOTES:

BIBLIOGRAPHY

DESCRIPTION OF PLATES

Plate VIII. Trirhabda virgata (Family Chrysomelidæ)

Trirhabda canadense

Plate IX. Chelymortha argus (Family Chrysomelidæ)

Odontota dorsalis (Family Chrysomelidæ)

Plate X. Odontota dorsalis

Epilachna borealis (Family Coccinellidæ)

Euphoria inda (Family Scarabæidæ)

Plate XI. Euphoria inda

Blepharida rhois (Family Chrysomelidæ)

Silpha americana (Family Silphidæ)

Plate XII. Doryphora decemlineata (Family Chrysomelidæ)

Spruce-borers (Family Buprestidæ)

Plate XIII. Adalia bipunctata (Family Coccinellidæ)

Cicindela primeriana (Family Cicindelidæ)

Chlænius æstivus (Family Carabidæ)

Chlænius pennsylvanicus

Anomoglossus emarginatus (Family Carabidæ)

Elater I (Family Elateridæ, species not determined)

Elater II (Species not determined)

Ellychnia corrusca (Family Lampyridæ)

Plate XIV

Aphrophora quadrangularis (Hemiptera homoptera)

Plate XV

Aphrophora quadrangularis

Cacœcia cerasivorana (Lepidoptera)

Euvanessa antiopa (Lepidoptera)

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