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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 the other name given to sex chromosomes? Sex chromosomes are also known as allosomes (the other chromosomes that are not sex chromosomes are known as autosomes).
Explain xylose isomeras A mixture of glucose and fructose, is produced from sucrose by the action of yeast invertase (β-fructofuranosidase), an enzyme which can only be extrac
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Explain Leaf Primordia ? In contrast to the root, which produces branches from meristematic tissue called the pericycle, shoots have areas of meristematic tissues called nodes
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Manifestations of anemia that are directly due to the diminished oxygen-carrying capacity of hemoglobin include: Answer A. pale skin. B. bleeding. C. bone pain. D. fatigue.
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A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the G2?
Which is the autotrophic group responsible for the production of most part of the molecular oxygen of earth? Cyanobacteria and Algae of the phytoplankton are the organisms that
What is the difference between spermatocyte I and spermatocyte II? The spermatocyte I (2n) undergoes the primary division of meiosis (meiosis I) originating two spermatocyte II
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