Question

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gene expression in eukaryotes can be regulated at various levels. certain mutations in flies may cause them to develop an extra set of legs or wings
, which determine the formation and arrangement of body parts in multicellular organisms, control gene expression
by regulation of
pre - mrna splicing
mrna degradation
dna transcription
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Explanation:

In eukaryotes, gene expression can be regulated at various levels. One of the key levels is DNA transcription. Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA). This is a fundamental step in gene expression as it determines the amount of mRNA produced, which in turn affects the amount of protein synthesized. DNA transcription is a highly regulated process, and mutations or changes in this process can have significant effects on the development and function of an organism. For example, certain mutations in flies may cause them to develop an extra set of legs or wings, which is likely due to disruptions in the regulation of gene expression at the level of DNA transcription.

Answer:

DNA transcription