ICQs19,20

Click to edit Master title style Click to edit Master text styles Second level Third level Fourth level Fifth level Click to edit Master text styles Second level Third level Fourth level Fifth level A molecule that guides axon outgrowth can be inhibitory to one set of axons and excitatory to another because of Differences in numbers of receptors on the axons Differences in kinds of receptors on the axons Combinatorial control All of the above Class 19 ICQs 2. The gap genes, which specify broad regions of identity along the A-P axis between the two poles of the embryo are transcribed a. before cellularization of the blastoderm. b. after cellularization of the blastoderm. .5 pt .5 pt Class 20 ICQs Transplantation of presomitic region 4.. This transplantation experiment with pre-somitic axial mesoderm shows that regional identity of somitic tissues is established a. before somite formation b. after somite formation. c. during somite formation .5 pt Class 20 ICQs Why are only two segments affected if mutation were in coding, all segments would be affected, so it must be in a regulatory region Transplantation of presomitic region (.5) This transplantation experiment with pre-somitic axial mesoderm shows that regional identity of somitic tissues is established a. before somite formation b. after somite formation. c. during somite formation The identity of segments is determined ______ segmentation in Drosophila, and ______segmentation in vertebrates before after after before before before after, after M