Tanscription/translation - Start and stop codons
The diagram represents a single strand of DNA containing a gene, in purple. Remember this gene is "read" in the 5' to 3' direction to produce an mRNA. To make a protein (polypeptide), mRNA is translated, or read, three nucleotides at a time. Each triplet codon specifies an amino acid to be added to the growing polypeptide chain. In addition to the amino acid designations, specific "start" and "stop" codons begin and end the protein sequence.
gene concept,translation 1,concept 1,transcription
- ID: 15545
- Source: DNALC.DNAi
Promoters are DNA sequences located in the 5' region adjacent to the transcriptional start site.
In most eukaryotic genes, coding regions (exons) are interrupted by noncoding regions (introns).
The majority of eukaryotic mRNAs contain a tract of A residues at the end. These polyA-tails are not encoded in the DNA. Rather, they are added to the pre-mRNA "post-transcriptionally" (after transcription). The end of pre-mRNA is cut by a specific enzyme
An image relating transcription and translation.
Different gene combinations result in different dominant/recessive ratios in offspring.
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DNA is a more stable molecule that evolved from RNA.
Use green fluorescent protein to tag expression of genes.
An animation introducing the basic concepts of genetics and recessive inheritance.