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mechanism of gastrulation -it is most impotant stage of embryonal development in which single layered blastula converts into 2 or 3 layered
major events during gastrulation -1 there is rearrangement of cells due to morphogenetic movement of the cells of
gastrulation gastrulation is the process through which the presumptive areas of organ specific rudimetns present on the surface of blastula move
locomotioncontinuous formation of new pseudopodia keeps amoeba in constant locomotion this is called amoeboid movement it occurs
amoebasystematic positionamoeba was discovered by russel von rosenhoff in 1755 he called it the little proteus after the
phylum chordatadefinition and introduction bilateral and deuterostomial eucoelomate eumetazoa basically possessing in the embryo
phylum echinodermatadefinition and indroduction bilateral and deuterostomial eucoelomate eumetazoa with rough tough and leathery
phylum arthropodadefinition and introduction bilateral and protostomial eucoelomate eumetazoa with metamerically segmented and
phylum molluscadefinition and introduction basically bilateral and protostomial eucoelomate eumetazoans whose soft body l millis
phylum annelidadefinition and introductionbilateral and protosomial eucoelomate eumetazoans whose long narrow and
phylum nematoda nemathelminthes definition and introduction
phylum platyhelminthesdefinition and introduction bilateral and protostominal organ grade eumetazoans without a body cavity
phylum cnidaria coelenterata definition and introductiontissue grade eumetazoans with a radial symmetry the
phylum poriferadefinition and introductionlowest multicellular animals or metazoans without true tissues ie at cellular level or
phylum protozoadefinition and introduction all unicellular or acellular eukaryotic animalsmost primitive gr
meiosisevery organism is mortal it becomes old and wornout with advancing age ageing and ultimately dies before
amitosisthis is direct cell division in which the genetic material is not duplicated and hence its distribution to the
cancer cell division like all other biological processes is under genetic control certain genes must regulate the
significance of mitosis1 reproduction william bateson 1906 wrote whenever i observe a dividing cell under
cytokinesisit is defined as the division or cleavage of cytoplasmic part of the cells into two daughter cells it
telophasethis is the final stage of mitosis in which the mitotic spindle disappears and each polar chromosomal group is
anaphasethis phase is of shortest duration it begins with a sudden separation of the two chromatids of each due
metaphasethis is a period of short duration the chromosomes are at the stage of their maximum condensation and hence
prophasethis is the first and longest phase of mitosis at its beginning all 10 nm segments of chromatids chromonemata of the
diploidy and haploidy in the chromosomal complement given species not all the chromosomes are different from each other in fact