11.03 Dev Rev ppt

D vegetal hemisphere cells in this region receive

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: rsors. d) vegetal hemisphere cells in this region receive signals from overlying animal hemisphere cells and become mesodermal precursors. b) die. The dorsalizing factors that induce formation of the organizer in Xenopus embryos a) arise at the point of sperm entry and move across the animal pole toward the organizer region. b) arise at the vegetal pole and move dorsally toward the organizer region. c) arise at the animal pole and move dorsally toward the organizer region. d) are present in ventral vegetal cells before the organizer forms. e) are present in dorsal animal cap cells before the organizer forms. What will happen to the dorsal /ventral patterning of the Xenopus embryo under the following conditions? If GSK-3 is overexpressed throughout the embryo , the embryo will be a. ventralized b. dorsalized Which of these statements is true in the Xenopus embryo? a) The organizer induces formation of neural ectoderm by locally inhibiting an inhibitor of neural cell fates in the animal cap. b) The organizer induces formation of neural ectoderm by locally inducing animal cap cells that would otherwise adopt epidermal fates. c) The organizer moves during gastrulation toward the future anterior of the body axis and then retracts again toward the ventral side, leaving notochord tissue behind it. d) The organizer cells use activated b-catenin as a master transcriptional regulato...
View Full Document

Ask a homework question - tutors are online