E55-2009 practice exam 2 key

Induces neural tissues by blocking epidermal fate in

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
surrounding tissues 3. ‘induces’ neural tissues by blocking epidermal fate in ectoderm 4. Tissue derived from organizer: notochord 24. (12 points) A. Experiment: in situ hybridization or antibody stain; Result: see transcripts or protein in Nieuwkoop center B. Experiment: again, in situ hybridization or antibody stain; Result: see transcripts or protein in location of organizer (dorsal margin, blastopore lip); C. Experiment: microinject gene transcript onto other side of embryo; Result: see duplicate axis; D. Experiment: antisense knockdown, treat animal with antibodies against protein; Result: see loss of dorsal structures and corresponding ventralization of the embryo 25. (4 points) 1. MAYBE 2. While you can deduce that dorsal structures are associated/correlated with inheritance of the gray crescent, this experiment does not distinguish between the gray crescent AND its adjacent regions. The gray crescent is an overt marking of a subregion, but we don’t know for sure if just the gray crescent is the magic juice that makes/signals dorsal structures, though it is a tantalizing marker that segregates with dorsal activity.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 2

induces neural tissues by blocking epidermal fate in...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online