Final answer:
Examples of gene 1, a transcription regulator, can be found in both E. coli's lac operon and Drosophila's sex determination, showing how gene expression is regulated to allow for proper metabolic functioning and developmental outcomes.
Step-by-step explanation:
An example in which both species express gene 1 which codes for a transcription regulator is the regulation of gene expression in organisms.
In prokaryotes, such as E. coli, the lac operon is a well-studied example wherein the presence of lactose induces the inactivation of a repressor protein, allowing RNA polymerase to transcribe genes necessary for lactose metabolism.
In eukaryotes, gene regulation can involve transcription factors that determine aspects like sexual characteristics, as seen in Drosophila where the sxl gene regulates the splicing of the tra gene mRNA, leading to the development of either male or female sexual characteristics.
These regulatory mechanisms are essential for the development and metabolic response of an organism and involve activators, repressors, and inducer molecules.
In both prokaryotic and eukaryotic cells, transcription factors control the level and timing of gene expression, which ultimately results in the formation of specific proteins necessary for life processes.