How Does DNA Mutation Occur From DNA Damage? When DNA carrying a damaged base is replicated, an incorrect base can often be inserted opposite the site of the damaged base in the complementary strand, and this can become a mutation in the next round of replication. Also DNA double-strand breaks may be repaired by an
How Does Genetic Variation Occur? Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of
How Does Genetic Drift Affect Human Evolution? Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool. Genetic drift can also cause a new population to be genetically distinct from its original population, which has led to the hypothesis that genetic drift plays a role in
How Many Steps Are In Evolution? Evolution can be seen as a two-step process. First, hereditary variation takes place; second, selection is made of those genetic variants that will be passed on most effectively to the following generations. What are the 4 steps of evolution? Construct an explanation based on evidence that the process of
Which Mutation Is Least Severe? The majority of mutations have neither negative nor positive effects on the organism in which they occur. These mutations are called neutral mutations. Examples include silent point mutations. They are neutral because they do not change the amino acids in the proteins they encode. Which mutation is not harmful? The
What Would Be The Most Likely Effect Of A Mutation In A SnoRNA That Changed The Antisense Sequence? What would be the most likely effect of a mutation in a snoRNA that changed the antisense sequence? The snoRNP would be assembled, but rRNA molecules would not be modified. What might be the effect of a
Where Do Mutations Occur How Do Mutations Occur? Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses. Germ line mutations occur in the eggs and sperm and can be passed on to offspring, while somatic mutations occur in body cells
Which Is Worse Insertion Or Deletion? Insertion or deletion results in a frame-shift that changes the reading of subsequent codons and, therefore, alters the entire amino acid sequence that follows the mutation, insertions and deletions are usually more harmful than a substitution in which only a single amino acid is altered. What is the most
What Are Some Common Causes Of Spontaneous And Induced Mutations? Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations. What causes both spontaneous and induced mutations? Spontaneous mutations can occur because of replication errors or as a consequence of lesions introduced
Is Evolution Neutral? The neutral theory of molecular evolution contends that at the molecular level, most evolutionary changes and polymorphisms within species are not caused by natural selection, but by random genetic drift. The theory was first put forward by M. Kimura in l968. Is evolution a natural process? Evolution is a process that results