Every human being has around 20,000-25,000 genes that regulate physical characteristics, such as eye color, face shape, and hair type.
Human DNA has a length of about 2 meters, but folded and neatly arranged in cells to form chromosomes.
Human traits such as intelligence, personality, and sports ability are influenced by the genetic combination of both parents.
Genetics also studies how environmental factors such as food, radiation exposure, and lifestyle can affect gene expression and human health.
Geneticians can study the history of human evolution by comparing modern human DNA with ancient human species such as Neanderthal and Denisovan.
Genetic research has helped develop technology such as DNA tests, gene therapy, and cloning.
Animals also have unique genetics, such as cats that have genes for different fur colors, and dogs that have variations of genes that regulate body size and shape.
Plants also have complex genomes, and genetic research has helped develop plant varieties that are more resistant to pests and diseases.
Some human diseases such as cancer and diabetes have genetic components, and genetic research continues to try to find ways to prevent or treat these diseases.
Although genetics can provide important information about the physical characteristics and human health, it is important to remember that a gene or trait does not determine all human identities or potential.
