In which order do the three germ layers appea | vedclass

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(D) During the process of gastrulation in embryonic development,the blastula undergoes rearrangement to form the three primary germ layers.First,the c

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None of the above

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(D) During the process of gastrulation in embryonic development,the blastula undergoes rearrangement to form the three primary germ layers.First,the cells move inward to form the endoderm,which is the innermost layer.Subsequently,the mesoderm forms between the endoderm and the outer layer.Finally,the ectoderm is established as the outermost layer.Therefore,the order of appearance is endoderm,followed by mesoderm,and then ectoderm. However,in the context of standard developmental biology,the layers are often described in their spatial arrangement from outside to inside as ectoderm,mesoderm,and endoderm. Given the options provided and the standard sequence of gastrulation,the formation typically initiates with the endoderm,followed by the mesoderm,and finally the ectoderm. Since this specific sequence is not listed,the correct answer is $D$.

In which order do the three germ layers appear during embryonic development?

Similar Questions

If ovaries of a pregnant mammal are removed,what will be the effect on the pregnancy?

The blastodisc or germinal disc refers to the protoplasm of the egg,which is restricted to a small area in:

$A$ post-gastrula embryo contains:

$A$: If both the ovaries are removed after the first trimester of pregnancy,still there would be normal growth of the foetus.
$R$: After the first trimester,the placenta secretes sufficient progesterone.

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