Evidence for Evolution

1. Evidence for Evolution 1.2.3.1.1 By: JP Garcia, Felipe Aguilera, Zac Christian, Bobby Garcia, Mikey Vasquez, and Augustine Ginto

2. Darwin’s finches: evidence of natural selection • Natural selection has been responsible for changes in the shape of the beak corresponding to characteristics of the available food supply • A beak better suited to the distribution of available seed types would become more common in subsequent generations

3. Artificial Selection • selection imposed on plants and animals by humans • operates by favoring individuals with certain phenotypic traits, allowing them to reproduce and pass their genes on to the next generation • Human-imposed selection has produced a great variety of breeds of cats, dogs, pigeons, and other domestic animals • Dogs resulted from selection for certain traits

4. Fossil evidence • Fossils can be used to construct a record of major evolutionary transitions over long periods of time • Horses, for example, evolved from small, forest-dwelling animals to the large and fast plains dwelling species alive today

5. Anatomical evidence • Homologous structures may have different appearances and functions even though derived from the same ancestral body part • The existence of vestigial structures supports the concept of common ancestry among organisms that share them

6. Convergent evolution • Convergent evolution is the independent development of similar structures in organisms that are not directly that are not directly related; often found in organisms living in similar environments • the evolution of similar forms in different lineages when exposed to similar selective pressures

7. True/False • Fossils can be used to construct a record of major evolutionary transitions over periods of time. true • Horses never evolved and have been large animals. False • Cats, dogs, pigeons, and other domestic animals evolved naturally. False

8. Multiple Choice