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.
Dominant gene: The state or genetic trait that will always express itself when present as part of a pair of genes in a chromosome. Gene: A section of a DNA molecule that carries instructions for the formation, functioning, and transmission of specific traits from one generation to another.Heredity: The transmission of characteristics from parents to offspring. Nucleotide: A group of atoms present in a DNA molecule.enetics is the branch of biology concerned with the science of heredity. The term heredity refers to the way in which specific characteristics are transmitted from one generation to the next.