sea cucumber sea anemone sea monkey sea snake sea star Question 14 Somites recei
ID: 201659 • Letter: S
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sea cucumber sea anemone sea monkey sea snake sea star Question 14 Somites receive morphogen signals from which of the following sources? Multiple answers can be selected Selected Answers: mesoderm Answers notochord mesoderm ectoderm nueral tube Question 15 The separation of gastrula cells into endoderm, ectoderm, and mesoderm is part of which developmental step? Selected Answer: none of the above cell proliferation programmed cell death cell differentiation cell expansion none of the above Answers:Explanation / Answer
Somites are formed from pre existing mesoderm at certain regular intervals, unique for different organisms.
In other words they are blocks of mesoderm.
Hence option b is the answer
The separation of gastrula into three layers namely, ectoderm, mesoderm and endoderm is known as gastrulation.
Option e is the answer, None of the above.
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