gene mutations and chromosomal mutations

Mutations are sudden heritable changes brought about by the composition of a gene or a chromosome. Accordingly, it can be a gene mutation or a chromosomal mutation. Sometimes, there may be just a change in the chromosome..

Some "green genes" randomly mutated to "brown genes". But this process alone can account for the change over the gene frequency in just one generation because mutation is rare and occurs under severe conditions only. ..

Mutation is defined as a chemical change in the DNA structure of a gene. A difference of a single base in the DNA molecule or a single error in the reading of the code can cause a change in the amino acid sequence which leads to mutation. The chemical substances that i..

The variations at the level of the gene which form the basis of the differences between related organism as well as the diversity among organisms is called gene mutation. Gene mutation is defined as a sudden discrete change in the genetic material o..

Mutation Breeding - Mutations are defined as heritable changes in structure number of genes or chromosomes. Mutations can be natural (spontaneous) or induced. Many natural mutations are recorded. But, stability of mutant expression needs a..

In these mutations one base pair is replaced by another. For e.g., - purine is replaced by pyrimidine (or) vice versa. The change in single base sequence causes silent mutation and non sense mutation..

Crop - Reported benefits after mutations Barley - Reduction in height, increased yield and day neutrality Groundnut - Improved oil content Wheat - Grain colour improved Rice - dwarfing, increased yield. In India, g induced mutations are carried out on seeds at Bhabha Atomic Rese..

Since Darwin's theory failed to explain certain facts, particularly the source of variations, several scientists started looking for bridging the lacuna in the theory. One such effort is the mutation theory proposed by Victor Hugo DeVries in 1902. According to this theory, new species ar..

Chromosomes..

According to this theory genetic mutations occur and accumulate with increasing age, causing cells to deteriorate and malfuncti..