How does genetic mutation occur?

Answer 1

Mutations are divided into three major types. But since it's only about gene mutation. :)

Gene mutation is the sudden changes of the DNA sequence. Gene being the unit for heredity. Therefore, gene mutation occurs in the DNA -- the Arginine,Thymine, Guanine and Cytosine nitrogenous bases.

An example of gene mutation is the point mutation.

Point mutation occurs due to the substitution of one nucleotide base pair with another. It may become a missense mutation where a nucleotide base pair is incorrect however it still forms the required amino acid.

Besides missense mutation, nonsense mutation could also occur due to point mutation. Instead of forming the correct codon, it forms the stop codon instead, resulting in the formation of smaller or shorter polypeptides.

Another type of gene mutation is the frameshift mutation.

The frameshift mutation occurs when a nucleotide base pair is deleted or a nucleotide base pair is inserted elsewhere in the chromosome, causing the whole chromosome to shift hence forming the incorrect polypeptides.

Answer 2

Gene mutations may occur in at least three Ways: they can be inherited from a parent, or acquired during a person's lifetime - See Epigenetics - or acquired during a person's lifetime - see Strontium 90.

Answer 3

A mutation is a permanent change in the DNA sequence of a gene. There are two ways in which a DNA mutation can occur: 1) Mutations can be inherited. This means that if a parent has a mutation in his or her DNA, then the mutation is passed on to his or her children. 2) Mutations can be acquired. This happens when environmental agents damage DNA, or when mistakes occur when a cell copies its DNA prior to cell division. Environmental agents (called mutagens) which cause mutation include ionising radiation eg x-rays, ultraviolet light (a component of sunlight) and certain chemicals. See: http://learn.genetics.Utah.edu/units/disorders/sloozeworm/ http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/genemutation http://ghr.nlm.nih.gov/handbook/mutationsanddisorders http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Mutations.html http://en.wikipedia.org/wiki/Mutation

Answer 4

when a part of the DNA code is miscopied in a daughter cell,the steps on the ladder in the model (the base[T,G,C, or A]) is either missing, switched, or replaced with the wrong code then a mutation occures.

Answer 5

DNA mutations can occur as the result of exposure to UV light, nuclear radiation, and chemicals in the environment, such as mutagens and carcinogens. DNA mutations can also occur due to errors in DNA replication.

Answer 6

Mutations can be hereditary, random, or caused by mutagens (environmental or extranious factors such as radiaton, smoking, drinking, etc.).

Answer 7

Natural mutations occur by chance and by pairing mistakes during replication . Induced mutations are result of induced chemical changes by mutagens .

Answer 8

B****