Question

Genetic map is one that

• A. Establishes sites of the gene on a chromosome
• B. Establishes the various stages in gene evolution
• C. Shows the stages during cell division
• D. Shows distribution of various species in a region

Answer 1

The correct option is A Establishes sites of the gene on a chromosome

A genetic map shows the distribution of a set of loci within the genome. Based on the method of construction and metric for measuring the distance between genes, there are three types of maps namely linkage, chromosomal, and physical. A chromosomal map shows the relative positions of genes along the length of a chromosome. Genes are placed by cytogenetic analysis or by linkage values. Linkage maps are based on recombination frequency which is directly proportional to the distance between genes, the values are used to locate genes on a chromosome. The physical map is constructed by direct measurement of physical distances between and within loci (in basepairs, kilobasepairs or megabasepairs). The correct answer is A.