Biological Science (7th Edition)
Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 19, Problem 6TYU
Summary Introduction

To review:

Consider discovering a loss-of-function mutation in a eukaryotic gene. The gene’s nucleotide sequence from the start site for transcription to the termination point of transcription is determined and no differences from the wild-type sequence are found.

The location where the mutation might occur and to study the behavior of the mutation from the given case.

Introduction:

A loss-of-function mutation occurs in a eukaryotic gene. The reason for mutation is determined by covering the entire length of the DNA (deoxyribonucleic acid) from the point of initiation to its termination.

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The following four mutations have been discovered in a gene that has more than 60 exons and encodes a very large protein of 2532 amino acids. Indicate which mutation would likely cause a detectable change in the size of the mRNA and/or the size of the protein product. Consider a detectable change to be >10% of the wild-type size. A table of the genetic code is shown below. First letter 0 00 U O A บบบ UUC UUA UUG U CUU CUC CUA CUG Phe GUU GUC GUA GUG Leu >Leu AUU AUC lle AUA AUG Met >Val UCU UCC UCA UCG CCU CCC CCA CCG ACU ACC ACA ACG GCU GCC GCA GCG Second letter C Ser Pro Thr Ala CAU CAC CAA CAG UAU UGU Tyr UAC UGC UAA Stop UGA UAG Stop UGG AAU AAC AAA AAG A GAU GAC GAA GAG His Gin Asn Lys Asp G Glu CGU CGC CGA CGGJ AGU AGC AGA AGG GGU GGC GGA GGG O AAG576UAG (changes codon 576 from AAG to UAG) Cys Stop Trp O GUG326AUG (changes codon 326 from GUG to AUG) Arg Ser Arg Gly DUAG DUA G DCAG DO AG deletion of codon 779 insertion of 1000 base pairs into the sixth intron (this particular…
2a) Suppose you have a gene in which a single base substitution has created the nonsense mutation 5'TAA3' (which will be transcribed into 5'UAA3' in the mRNA - but recall that mutations are changes in the DNA sequence). Name all the amino acids that could have been coded for by the original, unmutated codon at that position in the gene.
a) What is a mutation in molecular terms?      b) a mutation deletes a base in the genomic DNA discuss how that will affect the reading frame and expression product production. Using the following list of codons describe, using diagrams etc., how information stored in the DNA is translated into a peptide. Be sure to discuss all steps. In other words, use a diagram and give me sequences, transcription and translation steps. Show the sequences of the sense and the other DNA strand, the mRNA and the tRNA’s.                    UUU -phenylalanine         UCU -serine          AUG –initiation/methionine                CUU -leucine                    ACU -threonine                   GUU -valine                      UAA -Termination
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Bacterial Genomics and Metagenomics; Author: Quadram Institute;https://www.youtube.com/watch?v=_6IdVTAFXoU;License: Standard youtube license