Question

you create a hybrid transgene containing dna from a human and a mouse. which factor would most strongly affect when, where, and how much protein is expressed from that gene?
the chromosome upon which the gene resides
the genes coding sequence
the genes regulatory region
the age of the host animal

Explanation:

Gene expression (timing, location, level) is primarily controlled by regulatory regions (e.g., promoters, enhancers) that interact with transcription factors. The coding sequence determines protein structure, not expression patterns; chromosome location and host age have minor or indirect effects compared to regulatory regions.

Answer:

the gene's regulatory region