Practice: Patterns of Evolution Read the following scenarios and determine each pattern of evolution being shown. Explain how you know. Each of the 7 patterns of evolution we took notes on will be used once. 1. Butterflies, bats, and birds all have wings that allow them to fly. Butterfly wings. however. do not have bones like bat and bird wings do. Add Text Here! 2. 4000 years ago a population of cichlid fish were isolated in Lake Nagubago in central Uganda. Since then 5 new species have formed. distinguished by their differing coloration and mating rituals. These live groups of fish are considered unique species because they do not naturally interbreed. Add Text Here! 3. A population of mollusks are living in a stable ecosystem in the ocean. A rapid drop in sea level causes the formation of a lake, which isolates a group of mollusks from the rest. This quick environmental change causes rapid evolutionary change. Due to the new small population. genetic drift occurs. and mollusks with larger shells rapidly become the most common trait. Add Text Here! 4. The Dodo was a flightless bird, first spotted by Dutch sailors in 1598. Dodos had no known predators until sailors started hunting them and new invasive species were introduced. The last sighting of a Dodo was in 1662. Add Text Here! 5. Dogs and wolves share a common ancestor - the Grey Wolf. They share similar body shape. skull size. limb formation. genetic makeup and much more. Varying temperament in wolves eventually became so drastic resulting in extremely aggressive wolves and docile wolves that were eventually domesticated, leading to the formation of dogs. Add Text Here! 6. Male bumblebees go to flowers. such as orchids. to pick up chemicals that allow them to create attractive scents to put off for female bumblebees. Flowers have waxy pollen to stick to the bumblebee's heads and abdomens in order to spread their pollen to other flowers. These two traits - sticky pollen and chemicals for attractive scents - have evolved together, forming a mutualistic relationship between flowers and bumblebees. Add Text Here! 7. Fossil evidence suggests that whales evolved from land mammals. This was a slow process over thousands of years that resulted from continual reduction of the ancestral mammal's forelimbs over time, until they were reduced to fins.