It explains about importance of grey crescent, transplantation experiment,optic cup experiment-induction of lens , nuclear transplantation experiments in amphibians,in vitro fertilization and embryo transfer,major steps in IVF and ET,super ovulation, synchronisation of oestrus, embryo collection an...
Immediately after fertilization- Grey cresecent as a crescentic
area on one side of amphibian egg just below the equator
Marks polarity of the egg
Indicates the future dorsal side of the embryo.
Has vital role in the subsequent development.
Gastrulation process is initiated in this area amphibian
development.
The significance of grey crescent in amphibian development
can be illustrated by a simple experiment of separation of two
blastomeres at the first cleavage stage.
, A region characterised by self
differentiation and capable of
inducing organization in
neighbouring regions is called an
organizer.
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