Every trait in an organism be it phenotypic or genotypic is encoded by DNA present in it.
Step-by-step explanation:
DNA is the blueprint of all the characteristics in an organism.
According to central dogma of molecular biology DNA⇒RNA⇒PROTEIN
All the organisms have DNA enclosed in the nucleus of the cell which is responsible for all the phenotype and genotype characters of organism.
DNA contains information for specific proteins which perform functions in an organism.
During meiosis DNA on the chromosome undergoes recombination to form genetic diversity.
The eye colour, skin colour, height and many more traits are encoded by DNA in the form of proteins.
The DNA sequence coding for particular protein are termed 'gene'.
Gene is responsible for occurrence of the particular trait in a person. Genes are present on chromosomes and are passed on to the progeny.