Genetics

Student Response

Original DNA Strand:

3'-T ACCCTTTAGCCACT-5'

Transcription (base sequence of RNA):

3'-A UGGGAAAUCGGUGA-5'

Translation (amino acid sequence):

Met -- Gly -- Asn -- His -- Arg -- STOP

Mutated gene sequence one:

3'-T ACGCTTTAGCCATT-5'

Transcription (base sequence of RNA):

3'-A UGCGAAAUCGGUAA-5'

Translation (amino acid sequence):

Met -- Arg -- Asn -- His -- Arg -- STOP

Mutated gene sequence two:

3'-T AACCTTTACTAGGCACT-5'

Transcription (base sequence of RNA):

3'-A UUGGAAAUGAUCCGUGA-5'

Translation (amino acid sequence):

Ile -- Gly -- Asn -- Asp -- Pro-STOP

What is the significance of the first and last codons of an mRNA transcript?

The first codon ("Met") indicates the beginning of the transcription sequence. The last codon indicates the end of a protein sequence, which stops transcription.

Explanation:

Each protein sequence is coded with a starting and ending point, to indicate the length and type of the protein according to the sequence transcribed from the...
[ View Full Essay]