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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.
Classification according to the modes of transmission 1. Direct zoonoses: The direct zoonoses are those zoonoses that are transmitted from an infected vertebrate host to a
How are gases exchanged in sponges? The gas exchange in sponges occurs by diffusion from the external to the cells that absorb molecular oxygen and release carbon dioxide.
The cost of replacing these indirect uses of biodiversity, even if it were technically possible, would be so high as to render it impossible to duplicate. We also do not know how
What are pentoses? What are the roles of pentoses in DNA and RNA molecules? Pentoses are carbohydrates made of five carbons. The DNA molecule is made of a sequence of molecu
Q. What is the fluid that fills the nucleus called? The aqueous fluid that fills the nuclear region is called nucleoplasm or karyolymph. In the fluid there are enzymes, protein
Contact Osteogenesis: In this the osteogenic cells attach to the implant surface and the new (de novo) bone is formed on the implant surface first. The developing bone matrix can d
Ways to adapt to stress Now that you know the nature of stress, let us see what type of strategies plants have acquired to adapt to stress. You know that biological functions
What is the tympanum? In which part of the ear is it located and what is its function? The tympanum (or ear drum) is a membrane located in the middle ear just after the auditor
tertiary structure of protein
Systemic embolization occurs in 22 per cent to 50 per cent of cases of IE. Emboli often involve major arterial beds, including lungs, coronary arteries, spleen, bowel, and extremit
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