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Question
During which stage of development do cells arrange themselves into three layers?
A) morula
B) cleavage
C) gastrulation
D) organogenesis
Answer
This answer is hidden. It contains 1 characters.
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Programmed cell death is also known as ________.
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You are a substitute teacher in a high school biology lab class on the day the students are dissecting frogs. A particularly bright student happens to notice that the left adrenal gland is malformed in her frog. She asks if a problem in embryonic development could have caused that. Although there may be more than one reason, what might you propose as an explanation based on embryonic development?
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Cleavage and gastrulation take place in animals such as humans and birds but not in frogs.
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The end of a zygote that contains less yolk is the animal pole.
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Which of the following is a process by which an initial set of genes turns on a second set of regulatory genes, which eventually turns on a third set of genes?
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Of the choices listed, the first event that occurs during embryonic development is:
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The phase during which embryonic cells arrange themselves into three layers is called:
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C) organogenesis.
D) fertilization.
E) induction.