|A gene is defined as the basic physical and functional unit of heredity|
The definition of a gene states that it is the basic physical and functional unit of heredity. Genes, structurally are made up of nucleotides called DNA. Many of these genes codes for important proteins that help with the expression of traits and characteristics. However, a majority of these genes do not code for any proteins and are just “junk”.
According to the Human Genome Project, humans are estimated to have between 20,000 to 25,000 genes. Moreover, humans inherit two copies of each gene, one from each parent. However, a small number of genes marginally vary between individuals. These marginal differences are responsible for the unique characteristics of each individual.
Main Article: Genes
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Frequently Asked Questions
A gene is defined as the fundamental unit of heredity.
How many copies of genes do humans have?
Humans have two copies of each gene, one from each parent.