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Fertilization - Development Biology
Previously you knew the process which leads to the differentiation of the male and female germ cells, the sperm and ova, respectively. In this section we shall describe the process by which the sperm and the egg unite to form a zygote. This process is known as fertilization. Fertilization results in
Activation would essentially mean that a sequence of metabolic and morphological changes are triggered that in turn cause the division of a unicellular zygote into a multicellular organism. Mostly we will describe the fertilization in mammals with occasional references to sea urchins. It is true that depending upon the habitat as well as the life styles there may be variations in the fertilization process in diverse organisms. But generally the events of fertilization are more or less similar in many different organisms. Prior to the actual fusion of the sperm and the egg nuclei, the germ cells prepare themselves for the fertilization process.
How are the epithelial tissues classified? The epithelial tissues are classified according to the shape of the cells that form it (epithelial cells may be cuboidal, columnar, o
In what ways is water lost from the body? Water is lost from the body by a) Evaporation (lungs and skin), b) Urination and defaecation (faeces always have water).
Q. Minerals requirements for ulcerative colitis? Minerals: Mineral losses may be marked and unless replaced may contribute to a fatal outcome. A patient with moderately advance
Quantitative changes The quantitative changes in the availability of the active biomolecules occur in order to compensate for the loss of efficiency of the system caused by th
Viral vectors There are a large number of viral vectors available which can transfer the desired sequence properly into the host. Examples of the viral vectors are as follows
Advanced Nervous Systems - General Trend In Evolution In higher groups of animals you will observe clear trends towards centralisation of the nervous system, to maximize effe
Draw a diagram of the longitudinal section of a mature anatropous ovule and label any ten parts in it.
The reproductive system of house fly: In houseflies seperate male and female organisms are present. Male housefly reproductive system. The male hothe reproductive syste
Q. What is the nitrogen waste in amphibian larvae and in the adult animal? The terrestrial adult excretes urea since amphibian larvae are aquatic they excrete ammonia.
Anticoagulation in Prosthetic Valves The usual anticoagulants used are: (I) Warfarin sodium, and (2) Acitrorn (coumarin derivative). In patients who had thromboembolism
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