Genetics is a branch of biology concerned with the study of genes, genetic variation, and heredity in organisms.
Definition: Genomics is an multidisciplinary branch of biology focusing on the study the entire set of genes (genome) in an organism. You can watch the video also on Genetics vs genomics for better understanding
difference between genetics and genomics
Genetics is the study of single genes and their heredity and variation in organisms
Genomics is the study of all genes (the genome) of a person or  an organisms, including interactions of those genes with each other and with the person's/organisms environment.
Genetics is often a study of single gene or a few gene and their effects
Genomics is the study of complex diseases caused by multiple genes and environmental factors
Genetics is a classical branch of biology dates back to Mendel’s work on pea plants during early 1800, but rediscovered only during 1900.
Genomics is a much newer field flourished within last two decades due to technical advances in DNA sequencing and computational biology.
In 1906, William Bateson coined the term  “genetics” for the discipline of biology specifically dedicated to study heredity and variation.
The term genomics was coined in 1986 by Tom Roderick, a geneticist at the Jackson Laboratory in Maine, during a meeting about the mapping of the human genome.
Examples of genetic or inherited disorders include cystic fibrosis, Huntington's disease etc caused by mutation in a single gene
Genomics includes the scientific study of complex diseases such as heart disease, obesity, asthma, diabetes and cancer. (Multi gene diseases)
Primarily focussing on the study and treatment of single gene inherited disorders
Primarily focussing on the study and treatment of complex diseases caused by multiple genes and environmental factors
Genetics uses crossing, genomic mutation, recombination etc to study a trait associated with a gene
Genomics uses a combination of recombinant DNA, DNA sequencing methods, and bioinformatics to sequence, assemble and analyze the structure and function of genomes.

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