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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.
Characteristics of Ammonium Transport System The following are the characteristics of ammonium transport system: Ammonium transport system is ammonia' repressible
Cellular Type - Endosperm In this type, as the name indicates, the division of the primary endosperm nucleus is immediately followed by the laying down of a wall, which is us
Q. What are the most important worm infections? The most significant human worm infections are taeniasis, schistosomiasis, cysticercosis, ascariasis and ancylostomiasis (hookwo
Bovine spongiform encephalopathy The bovine transmissible spongiform encephalopathy (BSE), known as 'mad cow disease'-first noticed in Great Britain in 1986, is similar to scra
Assessment of Tricuspid and Pulmonary Orifice Areas Due to the rarity of tricuspid stenosis and pulmonary stenosis, no general agreement exists on what constitutes critical o
Q. What are the main opportunistic diseases that can affect AIDS patients? Among the opportunistic diseases that affect HIV contaminated people during the AIDS stage some are:
TYPES OF FOSSILS - S.No. Fossil E xample M ode of formation 1 Unaltered (Preservation) Wo
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Define Malnutrition - Effects on Milk and Effects on Mothers? Milk is the sole source of nourishment for many infants for upto 6 months or a year or even more. Therefore, the r
Which of the following structures in a vertebrate with a four-chambered heart would have blood with the highest oxygen concentration? And why?
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