<P> A locus ( plural loci ) in genetics is a fixed position on a chromosome , like the position of a gene or a marker ( genetic marker ) . Each chromosome carries many genes ; human 's estimated ' haploid ' protein coding genes are 19,000 - 20,000 , on the 23 different chromosomes . A variant of the similar DNA sequence located at a given locus is called an allele . The ordered list of loci known for a particular genome is called a gene map . Gene mapping is the process of determining the locus for a particular biological trait . </P>
<P> A locus ( plural loci ) in genetics is a fixed position on a chromosome , like the position of a gene or a marker ( genetic marker ) . Each chromosome carries many genes ; human 's estimated ' haploid ' protein coding genes are 19,000 - 20,000 , on the 23 different chromosomes . A variant of the similar DNA sequence located at a given locus is called an allele . The ordered list of loci known for a particular genome is called a gene map . Gene mapping is the process of determining the locus for a particular biological trait . </P>
where is the gene located in the chromosome
where is the gene located in the chromosome
A locus
A locus