If the dorsal lip of the blastopore is transplanted from one frog gastrula onto a second frog gastrula on the opposite side from the embryo's original blastopore, which result is the most likely?
A) A belly piece will form.
B) Gastrulation will cease.
C) A second complete embryo will form belly-to-belly with the recipient of the transplant.
D) The transplant will be rejected.
E) Only half an embryo will develop at the site of transplantation.

Question

Quizplus · Accepted Answer

The dorsal lip of the blastopore is responsible for inducing gastrulation in the embryo. When transplanted onto a second gastrula, it can induce a second embryo to form. The two embryos will develop belly-to-belly at the site of transplantation, resulting in the formation of two complete embryos. This process is known as twinning.

If the Dorsal Lip of the Blastopore Is Transplanted from One