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B3 – Life On Earth Food Webs / Competition
B3 – Life On Earth Food Webs / Competition

... • All species that have ever lived evolved from ...
DNA, RNA, PROTEINS STARTS WITH
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Science 9 Chapter 4 Practice Test
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... c. happens every time an individual produces new cells. d. happens only when a geneticist uses gene therapy. A neutral mutation a. does not affect the organism. b. never happens since all mutations affect an individual. c. cannot be transmitted to the next generation. d. will not be seen until two o ...
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... offspring more severely affected with the disorder. C20. A spontaneous mutation originates within a living cell. It may be due to spontaneous changes in nucleotide structure, errors in DNA replication, or products of normal metabolism that may alter the structure of DNA. The causes of induced mutati ...
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... shifted the F2s to 15o C. Several strains were isolated that now could grow at 15o C. Some of the suppressors of the sup-7 lethality were inseparable by recombination from the sup-7 mutation. Strains carrying sup-7 and the tightly linked suppressor (suppressor of a suppressor) no longer suppressed a ...
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< 1 ... 473 474 475 476 477 478 479 480 481 ... 531 >

Mutation



In biology, a mutation is a permanent change of the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA or other genetic elements. Mutations result from damage to DNA which is not repaired or to RNA genomes (typically caused by radiation or chemical mutagens), errors in the process of replication, or from the insertion or deletion of segments of DNA by mobile genetic elements. Mutations may or may not produce discernible changes in the observable characteristics (phenotype) of an organism. Mutations play a part in both normal and abnormal biological processes including: evolution, cancer, and the development of the immune system, including junctional diversity.Mutation can result in several different types of change in sequences. Mutations in genes can either have no effect, alter the product of a gene, or prevent the gene from functioning properly or completely. Mutations can also occur in nongenic regions. One study on genetic variations between different species of Drosophila suggests that, if a mutation changes a protein produced by a gene, the result is likely to be harmful, with an estimated 70 percent of amino acid polymorphisms that have damaging effects, and the remainder being either neutral or weakly beneficial. Due to the damaging effects that mutations can have on genes, organisms have mechanisms such as DNA repair to prevent or correct mutations by reverting the mutated sequence back to its original state.
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