1 A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. 2  Gene flow is any movement of genes from one population to another and is an important source of genetic variation. 3  Sex can introduce new gene combinations into a population.ithout genetic variation, some of the basic mechanisms of evolutionary change cannot operate. There are three primary sources of genetic variation, which we will learn more about: 1  Mutations are changes in the DNA.
Filed under: Dining. If youâre looking for an inexpensive way to beat the heat and stay cool this summer, check out Happy Hour at Sonic Drive In. Drinks and slushes are half price every day from 2:00 p.m. to 4:00 p.m. This offer includes soft drinks, iced teas, slushes (excluding CreamSlush treats) and Limeades only. Flavors and fruit may cost extra. Sonic states they have 398,929 fountain drink and slush combinations to choose from.
The NFL's Most Overpriced Beers. Only one other team, the Seattle Seahawks, have marked beer prices up more than seven-fold: Seattleâs $8 beers are a 710% increase over the comparable $0.99 options at local marts. The rest of the top five is filled out by the Oakland Raiders, Chicago Bears and Indianapolis Colts.