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DIVISION PHASE OR MITOSIS (M- PHASE)
Cell division was first observed by Naegeli 1842 in plant cells ,but thoroughly described by Eduard strasburger 1875. Fleming 1879 described . it in animals cells. The term mitosis was given to it by Fleming 1880. Since the most vital significance of mitosis is a precise duplication of genetic material and the latter resides in the nucleus it is advisable to divide the whole process into nuclear division (= Karyokinesis) and cytoplasmic division. Sequentially all changes undergone by a cell during mitosis are divisible in four main phases , viz prophase, metaphase, anaphase and telophase .
SE X DIFFERENTIATION MECHANISM - Primitive gonads are identical in both sexes upto 6 weeks of gestation pressure. This gonad is known as bipotential primordial gonad. It
To show that growing seeds take in oxygen Cork up one end of a tube, having first placed inside some damp cotton wool and some mustard seeds. Immerse the open end in dilute ca
There is no Interphase preceding second meiotic division. There is a brief intervening period called Interkinesis During this period there may be synthesis of some reserve fo
classification of plan''s tissue
Q. Why does the urinary volume increase when alcoholic beverages are ingested? Alcohol inhibits the ADH (antidiuretic hormone) secretion by the hypophysis and Low ADH reduces t
Explain about the water-soluble vitamin - Riboflavin? Riboflavin (vitamin B 2 ), a water-soluble vitamin, was discovered in milk as a pigment possessing a yellow green fluore
A true-breeding petunia plant with red petals was crossed with another true-breeding petunia plant with white petals. The plants of the F1 progeny had blue petals. When these F1 pl
Define the Community ecology of disease? Lyme disease is a debilitating infectious disease which has emerged in North America in the last two decades in the landscape context o
If 15% of the nucleotides in a DNA molecule contain guanine, what percentage of the nucleotides having each of the other three bases? Describe your reasoning. As guanine and cy
Examination is begun by placing the transducer in left parasternal region, usually in the third or fourth left intercostal space. From this position, a sector image of the heart
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