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Oogenesis
Oogenesis is the formation of ovum from oogonial cells that are formed in the ovary from primordial germ cells. And as in spermatogenesis it involves meiosis to produce haploid ovum. You have learnt in the section on spermatogenesis that the differentiation of sperm occurs after the meiotic events. In oogenesis the process of first meiotic division is very prolonged; and it is during this process that growth and differentiation of oocyte take place. In many animals most events related to oocyte differentiation occur during prophase I of first meiotic division. In animals which produce yolk-laden eggs, this phase is divided into
Male and female gametophytes are independent and free-living in: 1. Mustard 2. Castor 3. Pinus 4. Sphagnum Sphagnum
Pinocytosis: - The ingestion of dissolved materials by endocytosis. The cytoplasmic membrane invaginates and pinches off placing small droplets of fluid in a pinocytic vesi
Q. What do you mean by Polyphagia? Increased Hunger (Polyphagia): As patient is losing more sugar in the urine, he feels hungry very soon and tends to take more food. It is cal
Define requirements of Vitamin A of infants? On the basis of vitamin A ingested by breast fed infants in well-nourished communities, ICMR (1990) has recommended a daily allowan
State the Lantern Test The patient names colours displayed in the lantern and the mistakes are analyzed. This is not the best method of testing because it depends on the natu
Bio-medical waste management Persons coming in contact with bio-medical waste are prone to get injury from sharps likes needles. Injury due to sharps leads to life threatening
Define the Peripheral Nervous System (PNS) Peripheral nervous system consists of cranial and spinal nerves. There are twelve pairs of cranial nerves. They arise from brain.
Why does the recombination frequency of genes vary with the distance between them in the chromosome? The farther the distance among the loci of two genes in a chromosome the hi
What are the Sources of Nutrients of Cornea? Sources of Nutrients of Cornea: 1) Oxygen for the endothelium comes from aqueous humour and for epithelium from atmosphere th
Smooth muscles These muscles are beyond our control. That means these muscles are controlled by autonomic nervous system. They are non-voluntary muscles. They are found in thin
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