Question

Which of the following phrases defines the genetic term "locus"? (A) A Gene (B) a specific place on a chromosome where a particular gene resides (C) a character expressed by a gene or chromosome ( D) a gene with three or more alleles (E) a gene with only two alleles

Answer 1

B. a specific place on a chromosome where a particular gene resides.

A locus (plural loci) in genetics is the position of a gene on a chromosome. Each chromosome carries many genes; humans' 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.