•A gene is a segment of DNA which codes for a specific protein. Through transcription and translation, a protein is produced and then is used for cell processes.
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Gene expression is controlled by various mechanisms such as transcription factors, epigenetic modifications (DNA methylation, histone modifications), non-coding RNAs, and post-transcriptional modifications. These mechanisms influence whether a gene is turned on (expressed) or off (silenced) in a cell. Additionally, environmental factors and signaling pathways can also affect gene expression.
They tell a cell what it does. Example: a brain cell splits into two. But the second one has no purpose without the genes to tell it that it is a brain cell.
The D1x gene is controlled by the Pou4f1 gene in vertebrates. Pou4f1 is a transcription factor that regulates the expression of D1x in the developing nervous system.
The operon often controls the transcription of prokaryote genes.
Huntington's disease is a perfect example of a single gene trait. A mutation in this allele causes Huntington's disease in later life. A dominant trait. Widows peak us another. Any gene that controls the total expression of a trait is an allele defined as a single gene trait.
In prokaryotes, gene expression can be regulated directly at the level of transcription through operons, where multiple genes are controlled by a single promoter. This type of regulation is not as common in eukaryotes, where gene expression is typically regulated at multiple levels, including transcription, RNA processing, translation, and post-translational modifications. Additionally, prokaryotes lack the complexity of chromatin structure found in eukaryotic cells, which can also impact gene expression regulation.
A small section of a chromosome that controls the production of proteins is called a gene. Genes contain the instructions for making specific proteins through a process called gene expression, which involves transcription and translation of the genetic information.