TYPES OF REPRODUCTION IN INSECTS
PHYSIOLOGY OF REPRODUCTION
1. Spermatogenesis
: (occurs inside sperm tube)
mitosis
Spermatogonia --------> Primary spermatocytes (2n) Meiosis
mitosis
Spermatids (n) <------- Secondary spermatocytes (n)
Spermiogenesis--------------> Sperms (n)
2. Oogenesis
: (occurs inside egg tube)
Mitosis
Meiosis
Oogonia
---------> Primaryoocytes(2n) -------> Secondary oocytes (n)
Oogenesis
Mitosis
Ovum (n) <----------- Oocytes (n) <---------
3. Sperm transfer
(i) Intragenital:
Common method, through, aedeagus via vaginal orifice into female genital
passage.
(ii) Haemocoelous:
Sperms transfered into the body cavity e.g. Bed bug.
(iii)External:
Spermatophores are ejected out into open place by male, while female walk over it
and gets inseminated e.g. Silver fish.
4.
Fertilization:
Sperm entre into egg to produce morphogenesis. Egg nucleous divides
meiotically into
female gamete nucleus
and
polar body
. Then the fertilization occurs by the
fusion of male and female gamete nuclei.
Insect Morphology and Systematics
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