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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.
PHYLUM PROTOZOA Definition and Introduction All unicellular ( or acellular ) eukaryotic animals. Most primitive (Gr. Protos = first=zoon= animals ) organisms
Define Nutritional Requirements of Fats and Oils during Pregnancy and Lactation? ICMR (1990) recommends that linoleic acid requirements should be raised to 4.5 en% during pregn
What are gonads? What are the male and the female gonads in humans? Gonads are the organs that make gametes. They have the germ cells that undergo division and generate gametes
what are the different modes of nutrition
Define the Marasmic Kwashiorkor? In countries where the incidence of protein-calorie malnutrition (PCM) is high, a large number of cases show signs and symptoms of marasmus and
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Limb Field By several marking and transplantation methods it is feasible to identify in early embryos the specific areas of groups of cells that ultimately make different org
Nucleic Acids Friedrich Miescher (1868) discovered the presence of these compound in protoplasm ,but Altman (1889) introduced the term Nucleic acid. These acids are the lar
a) The elongation level of translation in eukaryotes requires three elongation factors, eEF-IB, eEF-1A and eEF-2, that have similar functions to their prokaryotic counterparts EF-G
vasoconstriction
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