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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.
What happens to traits in a species that is evolving over time?
CHEMICAL CHANGES DURING CLEAVAGE - 1. Synthesis of DNA occurs. 2. Synthesis of RNA (rRNA is absent, mRNA & tRNA are synthesized very little amount). 3.
Types of Osmotic Exchanges The osmotic exchanges that take place between an animal and its environment are of two different types: Obligatory exchanges and Regulated
The major concentration of noradrenergic (and adrenergic) cell bodies is found in locus ceruleus a nucleus in the reticular formation. The axons of these neurons project through t
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DEXTRIN Intermediate product of hydrolysis of starch. It consists of maltose & glucose. It is found in yeast & some bacteria.
Define Protein Requirements for physical fitness? Proteins provide energy to the body. Since exercise may increase an athlete's need for protein, depending on the type and freq
trinominal names
Q. Is there a larval stage in echinoderms? In echinoderms embryonic development is indirect, with ciliated larvae.
Define Natural Disasters - Public Nutrition? Disaster prone settings also shape the intensity and prevalence of food insecurity, these consist of poor who are exposed to recurr
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