define blastula??????
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Right after fertilization, a series of cell divisions makes a hollow ball of cells called a blastula. Learn how the blastula is formed, and explore several key transitions that occur that are required for the continued formation of the developing embryo.
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An animal embryo at the early stage of development when it is a hollow ball of cells.
OR
The blastula (from Greek βλαστός (blastos), meaning "sprout") is a hollow sphere of cells , referred to as
blastomeres , surrounding an inner fluid-filled cavity called the
blastocoele formed during an early stage of embryonic development in animals . [1] Embryo development begins with a sperm fertilizing an egg to become a zygote which undergoes many cleavages to develop into a ball of cells called a morula. Only when the blastocoele 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.
OR
The blastula (from Greek βλαστός (blastos), meaning "sprout") is a hollow sphere of cells , referred to as
blastomeres , surrounding an inner fluid-filled cavity called the
blastocoele formed during an early stage of embryonic development in animals . [1] Embryo development begins with a sperm fertilizing an egg to become a zygote which undergoes many cleavages to develop into a ball of cells called a morula. Only when the blastocoele 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.
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