Bio Ch47 Activities Quiz – Flashcards
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In sea urchins, the process of fertilization produces a(n) _____.
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zygote
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What is the cortical reaction?
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the formation of a fertilization envelope that bars additional sperm from entry into the egg.
( This is the cortical reaction.)
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As cleavage continues, a zygote forms into a solid multicellular ball called a(n) _____.
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morula
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Several hours after fertilization, cleavage results in the formation of a hollow ball of cells called a _____.
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blastula
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The three-layered embryo is the _____.
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gastrula
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The _____ eventually develops into the sea urchin's digestive tract.
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archenteron
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During gastrulation, invagination occurs at the _____.
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blastopore
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In vertebrates, the ectoderm gives rise to the _____.
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outer layer of skin
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During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.
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notochord
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During gastrulation in frogs, cells from the animal pole spread over the embryo and form the _____.
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ectoderm
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The notochord functions as a core around which mesodermal cells form the frog's _____.
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backbone
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An ectodermal thickening above the frog's notochord forms a _____.
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neural plate
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The _____ is(are) formed when the neural folds join and a portion of the neural plate sinks beneath the embryo's surface.
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neural tube
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The enlarged anterior portion of the neural tube will develop into a frog's _____.
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brain
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The posterior portion of the neural tube will develop into the frog's _____.
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spinal cord
