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Cleavage - Development Biology
Cleavage or segmentation is a series of cell divisions of the fertilized .egg through which it is converted into a multicellular structure, called blastula. The main characteristics of cleavage include:
The cell divisions in the somatic cells are mitotic. The daughter cells or blastomeres or cleavage cells are also derived as a result of mitotic divisions of the zygote. We may ask whether there are any differences between mitotic divisions of somatic cells and, of the zygote and the blastomeres derived from it during cleavage.
Mas s Extinction - Since beginning many species evolved and got extinct (in fact only 1 % is living). Sometimes it occured suddenly at large scale, (most recently dinosa
Animals of Estuaries The animals of estuaries and related wetlands such as marshes and swamps are tremendously important not only as denizens of their environment but also for
An interesting observation made by an American biologist H.C. Bumpus (1899) provides a good explanation for normalising selection. Bumpus collected some 136 injured house sparrows
FOSSILIS A TIO N - The organisms are preserved and fossilized when they are buried in the ice, in an oil rich soil, in the lava of volcano, in swamps, in desiccated deser
Dinoflagellates are single-celled to colonial protistans characterized by the two flagella, one girdling cell and the other trailing the cell. Some of the dinoflagellates exist in
Q. Classification of microorganisms? The microorganisms use our food as a source of nutrients for their own growth. This, of course can result in deterioration of the food. By
in sericulture industry do which stages of silkworm weaver buy? why do they do so?
describe the two scientific models for evolution (gradualism, punctuated equilibrium)
Myocardial Protection : To a great extent, the result of cardiac surgery depends on how well the myocardium is protected during cardio pulmonary bypass. Temporary depression of m
Elaborates Congenital Aortic Stenosis in details? More common in males (4: 1). High incidence of Bicuspid Aortic valve. Murmur present from early infancy and sometimes at birth
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