bio web quiz 18

bio web quiz 18 - 1. The figure below shows early cleavage...

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1. The figure below shows early cleavage in the sea urchin. Continued cell divisions gives rise to the next distinct embryonic stage called a: blastocoel. blastocyst. blastoderm. blastomere. blastula. 2. In vertebrates, unlike formation of a blastula, the formation of a gastrula results in: the folding of a neural plate to form a neural tube. an internal blastocoel which acts as an internal body cavity. three distinct germ-tissue layers which may not yet be arranged into organs. a distinct animal and vegetal pole. the first significant increase in overall size of the early embryo. 3. The process of gastrulation (seen below in the frog) will result in the formation of: a dorsal-hollow nerve cord. a blastocoel which will allow the embryo to have a distinct inside and outside. a mouth, or an anus depending on the animal species, will be formed. a significant increase in size. the first cells that are fully differentiated. 4. To prevent multiple sperm from entering an animal's egg cell, a condition called polyspermy, many animal
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bio web quiz 18 - 1. The figure below shows early cleavage...

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