When Gretchen starts being chased by a dog, her brain sends a signal to her muscles to run. Which neurons are at work?

The type neurons that is working in Gretchen's condition is the motor neurons. Although sensory neuron is also used to convert the external stimulus, the muscle movement is due to the signal from the motor neurons. Motor neurons are responsible for the of muscle movement may it be voluntary or involuntary.

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ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'