Which statement about the organizer of amphibians is true?
A) Organizer cells are located in the dorsal lip of the blastopore.
B) Organizer cells that involute early produce the same growth factor antagonists as those that involute late.
C) The first organizer cells to involute migrate posteriorly and induce structures of the trunk and tail.
D) As organizer cells migrate, they act on other cells by activating but not suppressing gene expression in other cells.
E) Later organizer cells involute and induce structures of the head.

Question

Quizplus · Accepted Answer

The organizer cells in amphibians are located in the dorsal lip of the blastopore, which is a depression in the early embryo that will later form the anus in most species. These cells produce signaling molecules that help pattern the developing embryo.

Which Statement About the Organizer of Amphibians Is True