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events prior to the sperm-egg fusion in a number of organisms that have been studied the sperm remain immotile in the testis or in the semen the
fertilization - development biologypreviously you knew the process which leads to the differentiation of the male and female germ cells the sperm and
secondary egg envelopes these are secreted by oviducts and other accessory parts of genital organs while the egg is passing through them from ovary
primary egg envelopes these are the egg envelopes which develop in the ovary between oocyte and follicle cells in the space occupied by the
egg envelopes like any other cell all the eggs are covered by the cell membrane or plasmalemma it is with two layers of about 50 a unit membrane
cell cycle urgent question please biology expert it3939s for an exam when m-cdk gets attached to cyclin it doesn3939t just get activated
external auditors reports the audit report is the final stage in the process of an audit the terms true and fair present fairly have special
compilations- non-assurance engagementswithin a compilation engagement such the accountant is engaged to need accounting expertise that opposed to
agreed-upon procedures - non-assurance engagementswithin an engagement to present agreed-upon procedures the auditor is engaged to carry out those
reviews - assurance engagementsthe objective of financial statements of a review is to enable an auditor to state where on the essential of
definition of auditing according to the international standard on auditing isa no 200 objective and common principles governing an audit of financial
oogenesis in mammals in mammals also the oogonial cells are derived from primordial germ cells the multiplication phase that is all of the oogonial
mechanism of maturationthe basic mechanism of maturation of ovum is more or less similar in all organisms the primordial germ cells that enter into
vitellogenesisvitellogenesis is the stage where much of the oocyte growth occurs the completion of second maturation division meiosis which may occur
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
tail - structure of the spermthe tail or flagellum is the longest part of the sperm by its movement it causes the sperm to swim with the head forward
middle piece - structure of the spermjust behind the head the small constriction neck carries a distal and a proximal centriole the two lie at right
head - structure of the sperm it exhibits a diversity of shapes in different animal groups eg spherical teleost fishes rod or lance shaped amphibians
spermiogenesis - spermatogenesisat the end of the meiosis the spermatids appear as simple spherical cells with a centrally located nucleus their
spermatogenesis in multicellular organisms the reproductive process commences with the production of gametes the gametes are the sex cells that
future - development biologyfertilization in flowering plants is essential for sustaining life on earth production of most crops depends on the
suspensor - pollen biologythe structure and function of suspensor have not been given adequate attention during the last decade however
embryo - pollen biologythe suspensor cells of young embryos of tropaeolum majus show that the activity of acid phosphatase increases from micropylar
endosperm - pollen biologythe examination of live material of j montana reveals that the division of the primary endosperm nucleus is transverse
pollen biologyfluorescence microscopy coupled with biochemical analysis has helped resolve the differential activity of the enzyme beta-l 3-