The given diagram shows the experiment of embryonic induction performed by Spemann and Mangold.After analysing the result of experiment, the structure that was designated by Spemann asprimary organiser is the
Correct answer: B. Dorsal blastopore lip area of donor's embryo
- A. Second neural plate in recipient's embryo
- B. Dorsal blastopore lip area of donor's embryo
- C. Mesoderm opposite to dorsal blastopore lip in donor's embryo
- D. Mesoderm opposite to dorsal blastopore lip in recipient's embryo
Explanation
In Spemann and Mangold's experiment, the dorsal blastopore lip of the donor embryo was transplanted to the recipient embryo, leading to the formation of a secondary axis, including a second neural tube. This region was designated as the 'primary organizer' because it had the ability to induce the formation of new embryonic structures. The second neural plate and the mesoderm regions opposite to the dorsal blastopore lip are not the primary organizers; instead, they are structures influenced by the organizer's inductive signals.
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About Embryonic Development
Embryonic development begins after fertilization with cleavage and formation of the morula and blastula, followed by gastrulation and the establishment of germ layers. It includes organ formation, tissue differentiation and early growth, rather than the later increase in size associated with postnatal development.
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