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General Morphology of Nematodes
> Sex
Determination
Sex Determination
The most common
mechanism of sex determination in nematodes is that of XO-XX type. That
males, in this system, have atleast one chromosome less than the
females. Bpigenetic factors may also control production of ma| e.1
It is also possible that because of over crowding in the populations or
lack of available nutrients there may be more males produced than
females.
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Eggs.
Nematode eggs are generally ovoid but may vary in shape. The
eggs have three membranous layers : (1) the external protein layer
secreted from the uterine wall ; (2) a chitinous membrane secreted
from the egg itself; and (3) a vitelline membrane. Egg surface may
be smooth (as in most of the plant parasitic nematodes) or may bear
various specialized structures (as in some animal
nematodes).
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