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(D) In the development of the frog embryo,the primary organizer is the region that induces the formation of the neural tube and establishes the body a

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Any of the above

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(D) In the development of the frog embryo,the primary organizer is the region that induces the formation of the neural tube and establishes the body axis. $1$. The $Grey \ crescent$ area,which appears after fertilization,is the precursor region that gives rise to the dorsal lip of the blastopore. $2$. The $Dorsal \ lip$ of the blastopore (often referred to as the dorsal tip of the gastrula) acts as the primary organizer. $3$. This region consists of $Chorda-mesoderm$ cells that undergo involution during gastrulation. Since all these terms describe the same developmental structure at different stages or functional perspectives,the correct answer is $D$.

Which one of the following parts serves the function of primary organizer in the frog embryo?

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