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bio 116 exam 4 Questions and Answers

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  • BIO 116

bio 116 exam 4 Questions and Answers In animal development, which of the following best describes the process of cleavage? - Ans:- Mitosis What are the cells created by cleavage called? - Ans:-Blastomeres Which of the following are the three germ layers contained in the gastrula? - Ans:-Ectoder...

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  • October 23, 2024
  • 76
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIO 116
  • BIO 116
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GraceAmelia
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bio 116 exam 4 Questions and Answers


In animal development, which of the following best describes the process of cleavage? - Ans:✔✔-

Mitosis


What are the cells created by cleavage called? - Ans:✔✔-Blastomeres


Which of the following are the three germ layers contained in the gastrula? - Ans:✔✔-Ectoderm,

mesoderm, endoderm


Which of the following stages of development is defined by the three embryonic tissue layers (ectoderm,

mesoderm, and endoderm)? - Ans:✔✔-Gastrula


What happens to a cell during the process of differentiation? - Ans:✔✔-It undergoes a change toward a

more specialized form or function.


A child is born without a fully developed pancreas. He is normal in all other respects, and thus doctors

believe that the problem most likely began early in development. During which of the following

processes did the original error most likely occur? - Ans:✔✔-Endoderm formation




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True or false? Early animal development progresses through distinct stages: first the production of the

zygote through fertilization, then cleavage, then the formation of the gastrula, and then the formation of

the blastula. - Ans:✔✔-false


After fertilization, embryonic development progresses through three stages:


cleavage, during which the zygote develops into a blastula through extensive cell division;


gastrulation, during which three tissue layers are established by the dramatic rearrangement of cells,

forming a gastrula;


organogenesis, during which the rudiments of organs develop.


The details of embryonic development vary by species, but the developmental sequence is consistent.

Embryonic development has been studied extensively in a few species, including sea urchins, frogs, and

chickens. All the images in this tutorial are based on frog development.




Part A - Differentiating between cleavage, gastrulation, and organogenesisPart complete


Determine which terms, phrases, and images describe each phase of development.


Drag each item to the appropriate bin. - Ans:✔✔-cleavage:


-blastula



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-cytoplasm partitioned into many cells


-picture without the layers




gastrulation:


-embryonic germlayers form


-blastopore


-gastrula


-colorful picture




organogenesis:


-neural tube


-organs begin to develop from germ layers


-somites


Part B - Gastrulation in a frog embryoPart complete




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Gastrulation is the stage of embryonic development following cleavage. During gastrulation, cell division

slows dramatically, and cells are rearranged in a precise way, forming three germ layers. The diagram

below illustrates gastrulation in a frog embryo, represented in cross section.


Drag the labels to their appropriate locations on the diagram. Use only pink labels for pink targets. Not

all labels will be used. - Ans:✔✔-A. blastocoel


B. primitive gut (archenteron)


C. ectoderm


D. mesoderm


E. endoderm


F. blastopore


G. yolk plug


H. blastopore forms


I. primitive gut begins to form


J. three germ layers in place


Part C - Organogenesis in a frog embryoPart complete


Tissue and organ formation begins during the process of organogenesis.
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