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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
Why is it important that a cell membrane does not allow all dissolved substances to diffuse freely through it? If the cell membrane were freely permeable, harmful substances co
Explain the Sponge Method? In the sponge method, sterilized sponge with 45 x 5 cm contact surface and free from antimicrobial agent is used. Aseptically, it is moistened with 1
Why is the determination of the blood types of the donor and of the recipient important in transfusions? The Red blood cells have different antigens in the outer surface of the
Give the salient features of phylum protozoa
Q. How do hormonal tests to detect pregnancy work? Laboratory tests to detect pregnancy commonly test for human chorionic gonadotropin (HCG) concentration in urine or blood sam
BIL E SALTS These are sodium or potassium taurocholate & glycolate. Lethocholic acid, cholic acid, deoxycholic acid & taurocholic acids are found in bile. Helps in em
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VASCULA R TISSUES (= FLUID TISSUES) - The vascular tissues are of two types: blood and lymph.
Bacteria: Bacteria have a protective covering called 'cell wall'. Beneath this. there is a plasma membrane which encloses protoplasm of the bacterium containing various types
Q. What is cerumen? Cerumen is a fatty, oily substance produced by theceruminous glands in outer part of ear canal. This compound is generally referred to as ear wax and, toget
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