Skim coating weak concrete is only a temporary fix. Another option is to lay a thicker overlay and slow-dry the new surface. To slow-dry, cover the driveway with moist, breathable material. Keep the material wet to provide additional moisture for the concrete to absorb.
The two main sources of genetic variation are gene shuffling and  mutations. A mutation is a process wherein the structure of a gene  is altered.Edit. Share to: Blobbert. 37,033 Contributions. Answered.In Genetic Engineering.he 4 types of genetic variation are 1) mutation-is the mutation of a gene. this is really rare, most mutations are in the recessive trait so they are hidden by a dominant t â¦ rait. Most mutations have no effect but some can be harmful and very few have positive effects.
Only mutations on coding regions of DNA can affect an organismâs phenotype. CONCEPTS MAIN IDEA Genetic variation comes from several sources. Genetic variation comes from two main sources: mutation and recombination.â¢ Mutation A mutation is a random change in the DNA of a gene. Thischange can form a new allele.ene poolsourcesgenetic variation 11.1 Genetic Variation Within Populations KEY CONCEPT A population shares a common gene pool. MAIN IDEAS â¢ Genetic variation in a population increases the chance that some individuals will survive.â¢ Genetic variation comes from several sources.