Embryonic development – Flashcards
Unlock all answers in this set
Unlock answersquestion
Determine which terms phrases and images describe each oase of development.
answer
Drag each item to the approprate bin
question
Cleavage
answer
blastula; cytoplasm partioned into many cells
question
Gastrulation
answer
embryonic germ layers form; blastopore; gastrula
question
Organogenesis
answer
neural tube; organs begin to develop from germ layers; somites
question
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.
answer
a. blastocoel
b. primitive gut (archenteron)
c. ectoderm
d. mesoderm
e. endoderm
f. blastopore
g. yolkplug
h. blastopore forms
i. primitive gut begins to form.
j. three germ layers in place.
question
Tissue and organ formation begins during the process of organogenesis.
Which five of the following statements are true about organogenesis in a frog embryo?
answer
-Some somite cells migrate to other locations in the developing embryo.
-The notochord does not persist in adult frogs.
-Somites form along the length of the notochord and neural tube.
-The endoderm gives rise to the lining of the frog's digestive tract.
-The neural tube forms from ectoderm and develops into the central nervous system.
