The following points highlight the five important types of DNA repair system. The types are: 1. Direct Repair 2. Excision Repair 3. Mismatch Repair 4. Double-Strand Break Repair 5. SOS Repair. Type # 1. Direct Repair: It involves the reversal of DNA damage. (i) Photo-Reactivation: Pyrimidine dinners (induced by UV rays) can be monomerised again by DNA photolyases in presence [...]
The following points highlight the three main stages for mechanism of induced mutagenesis. The stages are: 1. Base Analogue Incorporation 2. Base Alteration 3. Distortion of DNA. Stage # 1. Base Analogue Incorporation: Some chemical compounds are sufficiently similar to the nitrogen bases of DNA so that they occasionally are incorporated into DNA in place of normal bases, such compounds [...]
The following points highlight the top three types of multi-gene families. The types are: 1. Pseudo Genes 2. Selfish Genes 3. Split Gene - Exons and Introns. Multi-Gene Families: Type # 1. Pseudo Genes: Genes often exist which resemble other genes but their base sequence shows errors that make it impossible to contain biological information. These are pseudo genes which [...]