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The trachea extends from the larynx inferiorly, ending at which structure?

Arrange the following facial and neck structures in order from inferior to superior:

Which body habitus is characterized by a short, wide trunk, heavy bony framework, excessive body weight, and a high-riding alimentary tract?

Match the letters in the image below with the the morphogen that is critical in patterning the rostro-caudal axis in the developing embryo.

Ephrin is normally expressed in the caudal/posterior half of each somite, and neural crest migrates specifically through the rostral/anterior half of somites. If you generated a mouse that overexpresses the Ephrin gene in somites, as shown below, you would expect the neural crest  __________ . Pick the best ending for this sentence.

Match the letters in the images below of E11.5 mouse embryos with the best descriptor of the phenotype. The yellow arrows denote regions that have not developed correctly.  

The experiment shown below demonstrates the molecular effects of _________, in specifying _________ neural tube fates. Fill in the blanks. 

Which of the following statement best describes where spermatogonia are located in the testes.

One of your colleagues shows you these images of cross-sections from control (A) and mutant (B) E10.5 mouse embryos with a dotted line surrounding the DRG. The sections were incubated with a probe that labels activated Caspases (the dark product). Deletion of which gene would most likely result in the relative increase in caspase activation seen in the mutant DRG in B?  

Hirschsprung disease (aka congenital aganglionic megacolon) stems from a failure of enteric nervous system (ENS) innervation of the distal colon resulting in the inability to pass stool. Scientists studying this disease are interested in modeling the ENS in culture  beginning with human iPSCs. Considering what we know about the developmental pathway leading to ENS cells, what cell type would the scientist need to first differentiate the iPSCs into prior to generating ENS cells?