Search found 3 matches
Search found 3 matches • Page 1 of 1
- Sun Aug 16, 2009 1:03 pm
- Forum: Evolution
- Topic: Why not hundreds of different sexes, why only two ?
- Replies: 2
- Views: 5366
Sexual reproduction started with some reciprocal exchange of genetic material between similar individuals. But later organisms had to deal with the problem of inbreeding depression. As a result of this, a mechanism that ensures that sexual reproduction occurs only between unrelated cells, was evolve...
- Fri Jan 30, 2009 10:40 am
- Forum: Molecular Biology
- Topic: G-T Mismatch Repair
- Replies: 4
- Views: 4602
Yeah, 5-methyl cytosine gets spontaneously converted into thymine and in every case where it happens the G is correctly placed and T is wrong. But G-T mismatches can be formed due to some other reasons too ( e.g. replication errors) and there it is possible that the 'G' is incorrectly placed and 'T'...
Whenever a G -T mismatch is encountered in DNA, the cell repairs it using a specific mechanism which has a bias towards replacing T with C instead of replacing G with A. This helps in reducing mutations. But the question is - how does the cell know that it has to selctively replace T with C in a G -...