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Vitellogenesis
Vitellogenesis is the stage where much of the oocyte growth occurs. The completion of second maturation division (meiosis), which may occur after ovulation, results in ripe egg or ovum. In some species such as sea urchins and frogs, the female produces hundreds or thousands of eggs at a time where as in most mammals including humans only a few eggs are produced in the entire lifetime of the individual. In this section we shall discuss oogenesis in two groups of animals,
(1) The amphibians as an example of organisms which produce yolky eggs and
(2) Mammals, as an example of organisms whose eggs do not contain any yolk.
What is Nervous System? The nervous system is made up of associations of cells called neurons. Bundles of neurons are called nerves. The nervous system is divided into two part
Define the Chemical Fixation Method? Here chemical fixatives containing ethanol, acetic acid and formaldehyde etc. penetrates the cell and inactivates and immobilizes cellular
Q. What are the organs that are part of the male genital system? The organs that comprise the male genital system are the testicles, the vas deferens, the seminal vesicles, the
Subphylum Trilobitomorpha Subphylum Trilobitomorpha involves the trilobites. All species are extinct and the fossils point out that they were all marine forms belonging to Pal
commercially important bivalve species
Determine by nutritive muscular cell? The cells which form the gastrodermis lining the inner cavity of cnidarians. They carry out two functions: First is to absorb and digest f
what is the lungs structure in relation to the excretory system?
two larva forms of sponge
Homogenization is intensive blending of mutually related substances or groups of mutually related substances to form a constant of diverse insoluble phases (sometimes withaddition
Q. Can two normal individuals of the same species with sexual reproduction have identical karyotypes and identical genomes? And how is the human karyotype usually represented?
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