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[1] [2] Embryonic development begins with a sperm fertilizing an egg cell to become a zygote, which undergoes many cleavages to develop into a ball of cells called a morula. Only when the blastocoel is formed does the early embryo become a blastula. The blastula precedes the formation of the gastrula in which the germ layers of the embryo form. [3]
Fish embryos go through a process called mid-blastula transition which is observed around the tenth cell division in some fish species. Once zygotic gene transcription starts, slow cell division begins and cell movements are observable. [4] During this time three cell populations become distinguished. The first population is the yolk syncytial ...
Coregonus is a diverse genus of fish in the salmon family ().The Coregonus species are known as whitefishes.The genus contains at least 68 described extant taxa, but the true number of species is a matter of debate.
A relatively short time after fertilization, the cortical cytoplasm, located just beneath the cell membrane, rotates by 30 degrees, which results in the creation of the gray crescent; its establishment determines the location of the dorsal and ventral (up-down) axis, as well as of the anterior and posterior (front-back) axis and the dextro ...
Mammals at this stage form a structure called the blastocyst, characterized by an inner cell mass that is distinct from the surrounding blastula. [ 19 ] [ 20 ] [ 21 ] The blastocyst is similar in structure to the blastula but their cells have different fates.
The point of sperm entry defines the dorso-ventral axis - cells opposite the region of sperm entry will eventually form the dorsal portion of the body. [ 1 ] [ 3 ] In the frog Xenopus laevis , the animal pole is heavily pigmented while the vegetal pole remains unpigmented. [ 4 ]
Cavitation is the formation of the blastocoel, a fluid-filled cavity that defines the blastula, or in mammals the blastocyst. [1] After fertilization , cell division of the zygote occurs which results in the formation of a solid ball of cells ( blastomeres ) called the morula .
Even at this depth, there is an underwater current, with a velocity of 0.5–1 m/s (1.6–3.3 ft/s), that disperses some of the deposited eggs downstream in the tributary system. Fertilized eggs are 3.1–3.25 mm (0.12–0.13 in) in diameter and are held in spaces between rocks as well as in the ice crystals of the slushy, tributary floor. [ 8 ]
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