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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
Introduction: the term, population is derived from lation word' populus' meaning 'people'. Population is a group organism of same in a particular is at a definite time period.
Slow walking or Crawling This type of locomotion is seen while the animal moves on the substratum. It involves a metachronal rhythm of action in the parapodia. Each fifth or
Q. What is severity of the oesophagitis? The severity of the oesophagitis resulting from oesophageal reflux is determined by the content of gastric reflux mucosal resistance,
Define the Larval stages of fasciola hepatica? Fasciola hapatica reproduces both sexual and asexually. Cross-fertilization is of common occurrence. Copulation takes place in t
Calculate the pH - microbial survival and growth? Presence of microorganisms also depends on the pH of the medium. Most bacteria grow optimally near neutral pH (optimum 6.5 - 7
Consider an ecosystem consisting of a prey and a predator. If H is the density of prey, P is the density of predator, r is the intrinsic rate of prey population enhance and q is th
Q. Besides vertebrates two invertebrate phyla contain species that make pulmonary respiration. Which are these phyla? Terrestrial molluscs and the arachnid arthropods are the i
Explain the radiation cataract and steroid induced cataract of the eye. Radiation Cataract Exposure to radiation causes discoid posterior sub-capsular opacities. Mechanism o
difference between optic nerve and auditory nerve
How many are the known amino acids that form proteins in living beings? There are twenty dissimilar known amino acids that form proteins related to the genetic code of the livi
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