theory of pangenesis -proposed by charles
THEORY OF PANGENESIS -
Proposed by Charles Darwin.
According this miniature present in the every body cell i.e. called gemmule
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regulative theoryit was propounded by hens drieschhe performed experiments on the eggs of sea urchin similar to the experiments performed by rouxhe
gradient theory -it was given by t boveri amp was supported by mc childchild called it as metabolic axial gradient theoryaccording to it the egg has
organizer theory -it was propounded by spemann 1901he was given nobel prize of 1935 for this wrokhe studied the embryonic development of frog newt
germ layer theory -proposed by pander studied chick embryo developmentcoined the term ectoderm mesoderm amp
theory of pangenesis -proposed by charles darwinaccording this miniature present in the every body cell ie called
branches of embryology-1 descriptive embryologythis field of embryology is associated with the morphological description of
fundamental characters of embryonic development1 gametogenesis-testes amp ovaries are collectively called as gonads similarly
the process by which gametes are produced in the gonads is known as gametogenesisthe process of formation of male gametes or sperm is known as
spermatocytogenesisin this process four spermatid develop from one pgci multiplication phasethe spermotogonia or sperm mother cells lie next to the
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