Download - Spermatogenesis
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Fate maps
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Piebaldism due to mutation in KIT gene
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TS of Seminiferous tubule
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Spermiation
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Human sperm
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Human sperm in further detail
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Motile apparatus of sperm
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Acrosome formation
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Changes in the No of germ cells in the human ovary
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Growth of oocyte in frog
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Schematic representation of Xenopus oocyte maturation
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Oocyte in maturing stages
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Cortical action in sea urchin
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Cortical action in man
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Fusion of egg and sperm membranes in sea urchin and mouse
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Acrosome reaction in sea urchin egg
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Events leading to the formation of fertilization envelop and the hyaline layer
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Acrosome reaction in mammals
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Formation of fertilization envelope
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Wave of calcium release across sea urchin egg during fertilization
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Comparison of Spermatogenesis and Oogenesis
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Time line for the fertilization of sea urchin egg
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Resting potential and Fertilization potential
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Cleavage
• Cleavage is a series of rapid mitotic divisions whereby the enormous volume of egg cytoplasm is divided into numerous smaller nucleated cells. These cleavage stages are called blastomeres. One consequence of this rapid division is that the ratio to cytoplasmic to nuclear volume gets increasingly smaller as cleavage progresses. The rate of cell division and the placement of blastomeres with respect to one another is completely under the control of proteins and mRNAs stored in the oocyte of the mother
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Cell cycle of somatic and early blastomeres
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Role microtubules and microfilamenta in cell division
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Summary of Holoblastic and meroblastic cleavages
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Holoblastic cleavage in sea cucumber
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Cleavage in sea urchin
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Cytoplasmic rearranement
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Fate map of frog
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Cleavage of a frog egg
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Spiral cleavage in molluscs
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Right and Left handed coiling in snail
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Bilateral cleavage in tunicates
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Radial and rotational cleavage, a comparison
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Development of human embryo from fertilization to implantation
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Compaction, cell junction formation and cavitation
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Hatching of blastocyst from zona pellucida
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Timing of human monozygotic twinning with relation to extraembryonic membranes
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• Fate maps of different animals
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Fate map of Sea urchin
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Fate map of a tunicate
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Formation of syncytial cables
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Fate map of Fish
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Sea urchin development
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Discoidal Meroblastic cleavage
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Meroblastic cleavage in Zebra fish
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Overview of early development of selected animals
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Blastula of Zebra fish
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Cleavage of frog egg
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Reorganization of cytoplasm in the newly fertilized egg of frog (cortical rotation)
if we allow rotation the larva is normal, if rotation is inhibited with UVirradiation the embryo is featureless and vetralized if we treat the embryo with heavy water it will
enhance microtubule formation resulting into the formation of cyclopean eye and over
developed sucker and if we impose second rotation with centrifugation the result is
conjoined twin
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Ingression of primary mesenchyme cells
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Axis formation in chick
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Invagination of the vegetal plate
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Archenteron formation in sea urchin
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Gastrulation in Zebra Fish
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Fate map of frog
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Asymmertry of amphibian egg
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Organization of secondary axis by dorsal blastopore tissue
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Exp of Nieuwkoop and Nakamura
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Cell movements during frog gartrulation
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Cell movement during frog gastrulation
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Epiboly of ectoderm
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Cell movement during gastrulation in Xenopus
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Early movements of frog gastrulation
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Gastrulation
• It is the process of highly integrated cell and tissue movements and their rearrangements so as to develop a three layered embryo composed of ectoderm, mesoderm and endoderm.
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Types of cell movements
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Cell movement in embryo of chick
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Formation of blastoderm in chick
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Formation of two laryered blastoderm in chick
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Migration of endodermal and mesodermal cells through the primitive streak
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Cell movement of P/Streak
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First week of human development
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Eye Development
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