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.
All of Sonic's Frozen Favorites treats will be made with Real Ice Cream, including: 1  Sundaes and Banana Splits with toppings including hot fudge, chocolate, strawberry, caramel, pineapple, whipped topping, cherries and nuts on request.2  Shakes (vanilla, chocolate, strawberry, caramel, banana and pineapple).onic has more than 3,500 drive-ins coast to coast and serves approximately 3 million customers every day. Read also, Sonic expects new media plan to do more with less. Sonic has launched its new Real Ice Cream, part of the company's turnaround effort focusing on the differentiation of its quality products.