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. This change can form a new allele. Mutations in reproductive cells can be passed on to offspring. This increases the genetic variation in the gene pool.
The medial collateral ligament (MCL) is a broad, thick band that runs down the inner part of the knee, from the femur (thighbone) to about four to six inches from the top of the tibia (shinbone).The MCL's primary function is to prevent the leg from over-extending inward, but it also is part of the mechanism that stabilizes the knee and allows it to ...
The collateral ligaments are commonly injured structures in the knee. Injuries happen in many ways. Injury to a collateral ligament usually involves a significant force to the knee, such as a fall while skateboarding, skiing or a hard direct hit to the side of the leg or knee.Ligaments connect or attach bones to bones.he medial collateral ligament can tear in the middle of the ligament, where the medial collateral ligament attaches to the tibia, or where the medial collateral ligament attaches to the femur. If the force against the knee or leg is great enough other ligaments can tear as well.