Deducing a genotype : if assuming ptc as a simple gene trait, what other genotype would you select to put in this missing genotype box that could result in this phenotype ? why ?

the aswer is letter c

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.