Genetics is the science of heredity, genes , and the differences in living organisms. It is a biological discipline that deals with the structure and function of genes , their behavior and patterns of inheritance from the parents to the offspring. Genes determine traits, or characteristics, such as eye, skin, or hair color, of all organisms.
Each gene in an individual consists of two alleles: one comes from the mother and one from the father. Some alleles are dominant , meaning they ultimately determine the expression of a trait. Dominant and recessive are the two styles of genes.
The foremost between dominant and recessive is, dominant gene is expresses totally inside the phenotype whereas recessive gene should not be totally expresses inside the phenotype. Recessive gene cannot be completely expressed inside the presence of a dominant gene nonetheless when it is alone. But the terms can be confusing when it comes to understanding how a gene specifies a trait. This confusion comes about in part because people observed dominant and recessive inheritance patterns before anyone knew anything about DNA and genes , or how genes code for proteins that specify traits.