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INSECT
REPRODUCTIVE
SYSTEM
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Reproductive system
(1) of mixed embryonic origin - ecto- & mesoderm
(2) only functional in adult
(3) not required for survival of individual
(4) contributes directly to next generation
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Insect Reproductive System
gonad
Primary exit system
Secondary exit system
gonopore
Mesodermal
Ectodermal
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Female Reproductive System
ovariole
lateral oviduct
common oviduct
vagina
accessory gland
spermathecal gland
spermatheca
ovary
calyx
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Ovarioles
terminal filament
Germarium (2N)
Vitellarium (N)
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Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)1. Dieroistic
common sac
primary oocyte
follicle cells
Lateral oviduct
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Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Panoistic
primary oocyte
follicle cells
germinal vesicle(nucleus)
peritoneal sheath
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Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Meroistic
a. Polytrophic
primary oocyte
follicle cells
germinal vesicle(nucleus)
peritoneal sheath
nurse cells
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Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Meroistic
a. Polytrophic
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Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Meroistic
b. Telotrophic
primary oocyte
follicle cells
germinal vesicle(nucleus)
peritoneal sheath
nurse cells
trophic cord
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Male Reproductive System
testis
Ejaculatory duct
follicle
accessory gland
vas deferensseminal vesicle
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Male Reproductive Systemapical
cell
Germarium
Zone of Growth
Zone of Maturation
Zone of Transformation
2N
N
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Accessory gland products - Spermatophore
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GametogenesisGametogenesis - all gametogenesis follows the same general sequence
Germ cell
Mitosis to produce more germ cells
2N
2N Primary gametocyte(meiosis I prophase)
N N
Complete meiosis I
Secondary gametocyte
N N N N
Meiosis II
Gamete
Onset of meiosis I
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SpermatogenesisSpermatogonium
Mitosis to produce more germ cells
2N
2N Primary spermatocyte(meiosis I prophase)
N N
Complete meiosis I
Secondary spermatocyte
N N N N
Meiosis II
Early spermatids
Onset of meiosis I
Spermatozoa
Differentiation
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Spermatogenesis
2N
2N
N N
N N N N
Germarium
Zone of Growth
Zone of Maturation
Zone of Transformation
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Structure of Sperm – Mammalian model
acrosome
actin nucleus mitochondria
tail
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Sperm types
ApyreneEupyrene
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Sperm types
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Oogenesis
Oogonium
Mitosis to produce more germ cells
2N
2N Primary oocyte(meiosis I prophase - arrested - present at birth)
N
Complete meiosis I
Secondary oocyte(arrested at metaphase of meiosis II)
N Ovum
Onset of meiosis I
Ovulation
First polar body
Second polar body
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Germarium (2N)
Vitellarium (N)
Structure of ovariole
Vitellogenesis
Choriogenesis