Errors sometimes occur when DNA duplicates itself. Why might that be a good thing? Errors in DNA replication can never be a good thing. The rebuilding process proceeds much more quickly when a few errors occur. Most errors are, in fact, good for the organism in which they occur. The DNA replication process becomes more fine-tuned the more errors it makes. New genes can enter the population and be acted upon by evolution.
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During DNA replication, errors occasionally occur when DNA strands are copied. However, many cellular mechanisms help to remove many of these errors. Suppose an organism evolved such that DNA replication was seemingly perfect every time. What consequences might this hold for the organism? It would be more susceptible to recessive genetic disorders. It would be less robust and more susceptible to predation. It would be robust and out-compete other organisms. It would evolve slowly and would, therefore, be more likely to become extinct. It would not be prone to dominant genetic disorders.
Madhur L.
Why is it important for a cell to perform checks after DNA replication? A. Errors in DNA replication that occur in any cell type will be passed on to the offspring. B. Errors in DNA replication that occur in any cell type will always result in the death of the cell. C. If errors are not removed from areas with a gene, then the resulting lipids could be affected. D. If errors are not removed from areas with a gene, then the resulting proteins could be affected.
Sri K.
Errors in the transmission of genetic information to future generations are essential. Otherwise, organisms could not evolve over time. Some errors in the synthesis of new DNA during S phase in either meiosis or mitosis are not repaired. These errors usually involve single nucleotides. Errors that occur during prophase I of meiosis that are not corrected can involve the exchange of sequences between homologous chromosomes (duplications) or even nonhomologous chromosomes (translocations). Duplications are usually retained, and the organism remains viable without a change in phenotype. Translocations are usually lethal or significantly alter phenotype. In eukaryotes, duplications and the shuffling of parental genes through recombination are important sources of variation. Construct an explanation of the role of duplication as a source of raw material for future mutations and selection and contrast this type of variation with recombination.
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