A recessive trait must be shown in both allele to show, and a dominant trait can show in either trait.
Recessive Trait: one example of a recessive trait is having straight hair.
Dominant Trait: one example of a dominant trait is having black eyes.
Recessive trait: straight hair
Reference: http://www.favoritehairstylegallery.com/always-asian-hairstyle.html
Dominant trait: black eyes
Reference: http://tennisinfoblog.com/category/mens-tennis