For adults, the most common sources of food allergic reactions are: 1  shellfish (that includes shrimp, lobsters, and crabs) 2  nuts from trees (such as walnuts) 3  fish. 4  eggs. more information...
When binary traits are available, they become classified as Dominant or recessive. A dominant trait is a trait the is evident by the appearance of the organism. A recessive trait is a trait the is present but is not evident in the appearance of the organism. Dark hair is a dominant trait to a recessive light hair trait. Two brunettes may have a chance of having a blonde child due to the fact that either of them may carry the blonde haired gene and not show it.
Definitions. A dominant trait is one that is expressed in an individual who has only one copy of that gene. A recessive trait occurs when a person gets two copies of a mutant gene, or one from each parent.ow They Are Expressed. Dominant and recessive traits are expressed differently when referring to the Punnett Square developed by Gregor Mendel. A dominant trait is expressed by an uppercase letter, while a recessive gene is represented by a lower case letter.