A mutation can change one allele into another, but the net effect is a change in frequency. Mutation is a change in the DNA sequence of the gene. Mutation is a source of new alleles in a population. Over time, the allele will increase in frequency in the population. If conditions remain the same, those offspring, which are carrying the same allele, will also benefit. If it is an advantage, then that individual will likely have more offspring than individuals with the other phenotypes, and this will mean that the allele behind the phenotype will have greater representation in the next generation. Depending on the environmental conditions, the phenotype confers an advantage or disadvantage to the individual with the phenotype relative to the other phenotypes in the population. Natural selection has already been discussed. In fact, we know they are probably always affecting populations. Those factors are natural selection, mutation, genetic drift, and migration (gene flow). The Hardy-Weinberg equilibrium principle says that allele frequencies in a population will remain constant in the absence of the four factors that could change them.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |