Which of the following mutations would be most likely to havea harmful effect on an organism?(A) a deletion of three nucleotides near the middle of a gene(B) a single nucleotide deletion in the middle of an intron(C) a single nucleotide deletion near the end of the codingsequence(D) a single nucleotide insertion downstream of, and close to,the start of the coding sequence

Which of the following mutations would be most likely to havea harmful effect on an organism?(A) a deletion of three nucleotides near the middle of a gene(B) a single nucleotide deletion in the middle of an intron(C) a single nucleotide deletion near the end of the codingsequence(D) a single nucleotide insertion downstream of, and close to,the start of the coding sequence

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Description: Which of the following mutations would be most likely to havea harmful effect on an organism?(A) a deletion of three nucleotides near the middle of a gene(B) a single nucleotide deletion in the middle of an intron(C) a single nucleotide deletion near

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter11: Genome Alterations: Mutation And Epigenetics

Section: Chapter Questions

Problem 10QP: If the coding region of a gene (the exons) contains 2,100 base pairs of DNA, would a missense...

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As we described in class, in the early 1960's Francis Crick and colleagues set out to determine how many nucleotide bases make up a codon, before it was possible to sequence DNA and before Nirenberg and his colleagues solved the genetic code. To do this, they used a chemical mutagen that they knew made single nucleotide changes, used this mutagen to conduct a screen for mutations that disrupted a particular gene, and collected a number of different mutations in this gene. Briefly describe the logic they used to deduce that the codon length is 3 nucleotides long.
A mutant strain of bacteria is isolated in which the amino acid glutamine is often erroneously substituted for glutamic acid during protein synthesis. What kind of mutation might be underlying this defect? How could you test this hypothesis?
Geneticists have found that when they cut out a eukaryotic gene from genomic DNA that they can hybridize one of the strands of that gene to the mRNA for that gene by allowing the strands to hydrogen bond. Why did the appearance of these hybridized strands provide evidence of the existence of introns in eukaryotic genes?
You are studying the tryptophan synthetase gene that Yanofsky also examined to determine the relationship between the nucleotide sequence and the amino acid sequence of the gene. Yanofsky found a large number of mutations that affected the tryptophan synthetase gene. A) If you took this mutant E. Coli line (that has an Arginine at this location) and exposed it to a mutagen that could potentially change bases, what are the second mutations you would most likely discover that would restore the activity of the tryptophan synthetase gene and where would it be located? B) Most of the mutations that Yanofsky recovered were missense mutations. However, Yanofsky also recovered a nonsense mutation that changed amino acid number 15 into a stop codon. This codon normally encodes Lysine. Does the recovery of this mutation support the hypothesis that this Lysine residue is critical in the function of the tryptophan synthetase protein?
Your advisor, a brilliant bioinformatician, has high regard for your intellect and industry. she suggests that you write a computer program that will identify the exons of protein- coding genes directly from the sequence of the human genome. In preparation for that task, you decide to write down a list of the features that might distinguish protein- coding sequences from intronic DNA and from other sequences in the genome. What features would you list?
A researcher was mutating prokaryotic cells by inserting segments of DNA. In this way, she made the following mutation:Original TTGACAT 15 to 17 bp TATAATMutant TATAAT 15 to 17 bp TTGACATa. What does this sequence represent?b. What do you predict will be the effect of such a mutation? Explain.
Two eukaryotic proteins have one domain in common but areotherwise very different. Which of the following processes ismost likely to have contributed to this similarity?(A) gene duplication(B) alternative splicing(C) exon shuffling(D) random point mutations
Geneticists have found that when they cut out a eukaryotic gene from genomic DNA that they can hybridize one of the strands of that gene to the mRNA for that gene by allowing the strands to hydrogen bond. Why is it sometimes claimed that alternative splicing of exons from a single gene results in a set of proteins of related function?
In a particular region of the genome of a certain bacterium, one DNA strand is transcribed to give rise to an mRNA for protein A and the other DNA strand is transcribed to give rise to an mRNA for protein B. a) Would there be any problem in expressing the two genes? 2. b) If a mutation occurred to affect the structure of protein A, what would you observe in the structure of protein B?
What will be the order of amino acids derived from the following DNA sequence 5’-TGATCGCACAAT-3’? Explain briefly. (1.5) If the base G (denoted by an asterisk) in the sequence 5’-TGATCG*CACAAT-3’ is replaced by C due to a mutation, the new sequence will be 5’-TGATCCCACAAT-3’ what will be the new amino acid sequence? Explain briefly. (1.5) If the anticodon sequence of a tRNA is 5’-GCG-3’, what amino acid will it carry? Explain briefly. (1.5) What would be the effect of mutation if the C is changed to A in the anticodon? Explain briefly. (1.5)
While characterizing a mutation in a gene of interest, you discover that the mutation involves an insertion within the coding sequence of the gene. You suspect that the inserted sequence is a transposon and would like to determine which of the three major transposon families it belongs to. What sequence elements could be looked for within the inserted sequence that would help place it in one of the three families?
How might a single base substitution in the sequence of a gene affect the amino acid sequence of a protein encoded by the gene, and why? A - It is not possible for a single base substitution to affect protein structure, because each codon is three bases long. B- The amino acid sequence would be substantially altered, because the reading frame would change with a single base substitution. C - Only a single amino acid could change, because the reading frame is unaffected. D- All amino acids following the substitution would be affected, because the reading frame would be shifted.