explain what happens during a point mutation?

Answer 1

A point mutation occurs in one nucleotide molecule in its triplet codon of 3 nucletides. One of the base pairs is change. For example adenine could become thymadine. This would result in a change of one codon. which if not corrected would change the paticular amino acid of the codon and could affect the protein that the amino acid is a part of. For example a codon coding for a particular amino acid could chacnge to a stop codon and chop off (truncate), the protein at that point resulting in a shortened useless protein.Such mutations cause certain types of mucular dystrophy etc. Point mutations are a sources of genetic change. and a minority of those chacnges are positive althogh most are neutral ir deleterious. Cosmic rays can cause point mutations. Also carcinogenic chemicals, old age ionising radiation and certain chemicals. (e.g. 5 fluoro uracil etc.)
Doc. Dan.

Answer 2

A Point Mutation Occurs When

Answer 3

This occurs when one nucleic acid (adenine, cytosine, thymine, guanine), a building block of DNA and RNA is simply replaced during any changing of DNA state: Translation, Transcription, etc. It usually involves a mistake from the nucleotide-pairing enzyme, DNA polymerase. The enzyme pairs and proofreads nucleotides and is very accurate, but sometimes makes mistakes that other enzymes eventually correct later. This describes bacteria mainly and not eukaryotes, because we don't fully understand eukaryotic genetic replication.
A POINT MUTATION:::

It's similar to spelling a word with the wrong letter, like:
H O U S E

and

H O R S E

You, of course, wouldn't paint your horse, or ride your house, BUT... in the Biological world, it's very possible to make the simple "point" error. So, when translating DNA to a complementary strand, like this:

A--C--G--T should be paired in the helix with:
T--G--C--A.

A and T are compliments, just like C and G.

THIS IS NOT THE ONLY TYPE OF MUTATION.
There are also shift mutations that shift the ENTIRE strand known as:
Deletion=deleting a letter
or
Insertion=inserting a letter

Examples:

ACGT
TGCA could be TACA (a POINT MUTATION) or TAGCA an insertion shift or GCA (a deletion shift)

Answer 4

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RE:
explain what happens during a point mutation?

Answer 5

if a normal sequence is CAGC then the sequence at one point changes to TAGC. This can cause abnormal base pairing. With each transcription occurs, then there will be an area in that point which will eventually be a phenotypic mutation.

Answer 6

point mutation is a change in a single base or base pair of the nucleotides. however, it doesnt really affect the organism at all. it is just a small mutation