How are the traits expressed in an organism?
The traits are expressed in the form of genetic character of the organism called the genotype and the visible physical expression of the genetic character called the phenotype.
Example: Based on the character of plant height, there can be contrasting character for tallness and dwarfness. The character for tallness is denoted by a different genotype as compared to the character of dwarfness. Therefore, tall and dwarf characters of the plants are phenotypes of the plants, while the genes responsible for it are the genotypes.
Expression of traits:
Genes are based on the inheritance of chromosomal characters of an individual. The genes are present in the chromosomes and based on the type of gene of the organism it can be expressed as a visible trait.
The gene is at first converted to mRNA through transcription and then the mRNA produces the functional proteins which help express the visible character in the organism. Therefore, the generation of proteins from the gene helps in the generation of specific phenotypes.