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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.
Protozoans Prokaryotes represent only a few thousand of the estimated 2 million species of living beings known on the earth today. The rest are mostly eukaryotes that form the
a) Name the mineral elements needed by (i) bones, (ii) red blood cells, (iii) the thyroid gland b) Which of these elements is (i) present in milk, (b) lacking in milk?
Under the limiting oxygen conditions experienced in by vigorous exercise, the configuration of NADH by glycolysis exceeds the ability of the respiratory chain to oxidize it back to
Q. Where is it produced and what is the function of secretin in the digestive process? Secretin is made in the duodenum the chyme acidity causes the duodenum to release this ho
Feline calcivirus infection This disease is caused by a virus under the family Caliciviridae. Its symptoms include rhinitis, tracheitis and pneumonia. The animals are lethargi
what Photoperiodism
EARTHQUAKES An earthquake with its terrible aftereffects is one of the most frightening and destructive phenomena of nature. It can be defined as a sudden movement of
H y p o ma g n e s e m i a It is also known as grass staggers or lactation or grass tetany and results in clonic and tonic muscular spasms and convulsions. E
ELIZA stands for enzyme linked immune diffusion assays. It works on standard of antigen antibody reaction.
Barker’s in Utero Hypothesis The developmental origins of adult disease, often called as the ‘Barker hypothesis’ states that adverse influences early in development, particula
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