Answer :
Genes located along the x chromosome are called X-linked genes.
The fundamental structural and operational unit of heredity is the gene. DNA makes up genes. Some genes serve as instructions for creating molecules known as proteins. Many genes do not, however, encode proteins. Genes in humans can range in size from a few hundred DNA bases to more than 2 million bases. Humans are thought to have between 20,000 and 25,000 genes, according to the Human Genome Project, an international research endeavor that aimed to decipher the human genome's sequence and catalogue its genes.
Each gene is present in two copies, one from each parent, in every individual. Less than 1% of all genes are slightly variable from person to person, but the majority of genes are the same in all humans.
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