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.
1 Dominant: a trait that is visible and can cover up other traits when there is more than one present. 2  Genotype: the genetic makeup of an organism, or the versions of a gene that an organism has. 3  Heterozygous: having two different versions of a gene.4  Homozygous: having two identical versions of a gene. Allele: a different version of a gene. 2  Dominant: a trait that is visible and can cover up other traits when there is more than one present. 3  Genotype: the genetic makeup of an organism, or the versions of a gene that an organism has.