Download 11a-ReprodGameto13

INSECT REPRODUCTIVE
SYSTEM
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
Insect Reproductive System
gonad
Primary exit
system
Secondary
exit system
Mesodermal
Ectodermal
gonopore
Female Reproductive System
ovary
ovariole
calyx
lateral oviduct
common oviduct
spermathecal gland
spermatheca
accessory gland
vagina
Ovarioles
terminal
filament
Germarium (2N)
Vitellarium (N)
Types of Ovarioles
1. Dieroistic
Ovarioles
1.
Dieroistic
2.
Panoistic
3.
Meroistic
a. Polytrophic
b.
Telotrophic
(Acrotrophic)
common sac
primary oocyte
follicle cells
Lateral oviduct
Ovarioles
1.
Dieroistic
2.
Panoistic
3.
Meroistic
a. Polytrophic
b.
Telotrophic
(Acrotrophic)
Types of Ovarioles
2. Panoistic
primary oocyte
peritoneal
sheath
germinal vesicle
(nucleus)
follicle cells
Types of Ovarioles
2. Meroistic
a. Polytrophic
primary oocyte
nurse cells
peritoneal
sheath
germinal
vesicle
(nucleus)
follicle cells
Ovarioles
1.
Dieroistic
2.
Panoistic
3.
Meroistic
a. Polytrophic
b.
Telotrophic
(Acrotrophic)
Types of Ovarioles
2. Meroistic
a. Polytrophic
Ovarioles
1.
Dieroistic
2.
Panoistic
3.
Meroistic
a. Polytrophic
b.
Telotrophic
(Acrotrophic)
Types of Ovarioles
2. Meroistic
b. Telotrophic
nurse cells
trophic cord
primary oocyte
peritoneal
sheath
germinal
vesicle
(nucleus)
follicle cells
Ovarioles
1.
Dieroistic
2.
Panoistic
3.
Meroistic
a. Polytrophic
b. Telotrophic
(Acrotrophic)
Male Reproductive System
testis
follicle
vas deferens
seminal
vesicle
accessory gland
Ejaculatory duct
Male Reproductive System
2N
apical
cell
Germarium
Zone of Growth
N
Zone of Maturation
Zone of Transformation
Accessory gland products - Spermatophore
Gametogenesis
Gametogenesis - all gametogenesis follows the same general sequence
Germ cell
2N
Mitosis to produce
more germ cells
Onset of meiosis I
Primary gametocyte
(meiosis I prophase)
2N
Complete meiosis I
N
N
Secondary gametocyte
Meiosis II
N
N
N
N
Gamete
Spermatogenesis
Spermatogonium
2N
Mitosis to produce
more germ cells
Onset of meiosis I
Primary spermatocyte
(meiosis I prophase)
2N
Complete meiosis I
N
N
Secondary spermatocyte
Meiosis II
N
N
N
N
Early spermatids
Differentiation
Spermatozoa
Spermatogenesis
Germarium
2N
Zone of
Growth
2N
N
N
N
Zone of
Maturation
N
N
N
Zone of
Transformation
Structure of Sperm – Mammalian model
nucleus
mitochondria
tail
actin
acrosome
Sperm types
Eupyrene (eusperm)
Apyrene (parasperm)
-nucleated and fertile
- anucleate and infertile
Sperm types
Giant sperm – Ptilid beetles
Oogenesis
Oogonium
2N
Mitosis to produce
more germ cells
Onset of meiosis I
Primary oocyte
(meiosis I prophase - arrested - present at birth)
2N
Complete meiosis I
First polar body
N
Secondary oocyte
(arrested at metaphase of meiosis II)
Ovulation
Second polar body
N
Ovum
Structure of ovariole
Germarium (2N)
Vitellarium (N)
Vitellogenesis
Choriogenesis