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MOSAIC THOERY -
It was given by W. Roux.
He studied the development of frog's egg. He destroyed one cells by a hot needle out of 2-cells formed as a result of first cleavage. He observed that the remaining cell formed only half of the embryo.
On the basis of the above experiment, he derived a conclusion that the fate of various parts of the egg is predecided.
He further explained that these substances of the eggs remain undifferentiated before fertilization.
The fertilizaton causes reorientation of these substances & the cleavage separates these substances.
Chromosomes are the condensed, fibrillar, self- replicating genetic structures of cells containing the cellular DNA which bears in its nucleotide sequence the linear array of gene
Q. How do contraceptive pills generally work? Contraceptive pills generally contain the hormones progesterone and estrogen. If taken daily from the 4th day after menses the abn
What is a biosphere? A biosphere is a set of all of the ecosystems of the planet.
Bacteria never have a nucleus but some members of the domain Archaea are known to contain a true nucleus.
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