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Toys are placed around the room, and Marcus is told to “go play.” The experimenter takes data on the time Marcus spends engaging with each of the available toys to determine preference. Which of the following preference assessment procedures was implemented?

¿Quiénes eran los moriscos?

¿Qué es la Contrarreforma?

¿Cuáles son los dos grandes reinos cristianos que se forman durante la Edad Media?

Multiple control of problem behavior means that two or more topographically different behaviors can all be maintained by the same single reinforcer.

Which of the following approaches would be an example of a Reverse Genetics approach in C. elegans?

Consider the segment polarity genes.  If the reciprocal signaling center between the engrailed (En) and wingless (Wg) expressing cells is disrupted (e.g., by a loss-of-function mutation in hedgehog), what is the immediate expected consequence for the En expression stripe?

A C. elegans mutant has a mutation in LIN-12/Notch that prevents its cleavage by the protease that acts in this pathway. The vulva cells in these mutants would likely develop with three primary (1˚) cell fates and no secondary (2˚) cell fates.

If a C. elegans hermaphrodite is heterozygous for a null (no activity) mutation in a maternal effect lethal gene, what percentage of its progeny embryos will die?

You have identified a new Drosophila segmentation gene that is expressed in a seven stripe pattern in the late syncytial blastoderm stage. A. To which class of patterning gene does your new gene likely belong? B. If your hypothesis is correct, what general phenotype are you likely to observe if you inactivate this gene?