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- Is a chromosome deletion equivalent to a frameshift mutation ? Why orwhy not?What percentage of the DNA in the genome actually corresponds to genes? How much is actually protein-coding exons? What makes up the rest?When the human genome sequence was finally completed, scientists were surprised to discover that the genome contains far fewer genes than expected. How many genes are present in the human genome? Scientists have also found that there are many more different kinds of proteins in human cells than there are different genes in the genome. How can this be explained?
- If the coding region of a gene (the exons) contains 2,100 base pairs of DNA, would a missense mutation cause a protein to be shorter, longer, or the same length as the normal 700 amino acid proteins? What would be the effect of a nonsense mutation? A sense mutation?. The physicist Stephen Hawking, famous for his theories about black holes, has lived past the age of 70 withamyotrophic lateral sclerosis (ALS), a paralyzing neurodegenerative disease that is usually fatal at a muchyounger age. Recently, geneticists discovered that amajor cause of ALS is the unusual expansion of ahexanucleotide repeat (5′-GGGGCC-3′) that lieswithin a gene called C9ORF72, at a location outside ofthe gene’s open reading frame (ORF). A single expanded allele is sufficient to cause ALS, but the reasonthe disease allele is dominant remains unclear. Someexperimental results support the theory that the allelemakes a toxic RNA containing the expanded repeat. Ifthis theory is correct, in what ways is the mutant ALScausing allele similar to the mutant allele that causesHuntington disease? In what ways is it similar to themutant allele that causes fragile X syndrome?Why is a random mutation more likely to be deleterious than beneficial?
- Can a harmful mutation-causing genetic disease exist from generation to generation without exhibiting the symptoms of the disease? Explain.With regard to mutations, what is meant by the terms“harmful,” “beneficial,” and “neutral”? Why it issometimes an oversimplification to consider a mutation aseither harmful, beneficial, or neutral?Are all human mutations handed on to their children? Please explain.
- Why in humans, most new mutations found in the progeny come from the sperm ratherthan from the egg?2. A reversion is a mutation that returns a mutant codon back to a codon that gives a wild-type phenotype. At the DNA level, this type of mutation can be an exact reversion or an equivalent reversion. GAG First GTG Exact GAG (glutamic acid) mutation (valine) reversion (glutamic acid) GAG - GTG First Equivalent (valine) reversion GAA (glutamic acid) mutation (glutamic acid) GAG First GTG Equivalent - GAT (glutamic acid) mutation (valine) reversion (aspartic acid) An equivalent reversion produces a protein that is equivalent to the wild type in structure and function. This can occur in two ways. In some cases, the reversion produces the wild-type amino acid (in this case, glutamic acid), but it uses a different codon than the wild-type gene. Alternatively. an equivalent reversion may substitute an amino acid structurally similar to the wild-type amino acid. In our example, an equivalent reversion has changed valine to an aspartic acid. Because aspartic and glutamic acids are structurally…Does a single base-pair substitution in a strand of DNA always result in a new amino acid in the protein coded for by that gene? Why or why not?