Question

If a person wants to calculate the map distance of genes on chromosomes then he should have

• A. total number of cross overs between the chromosomes
• B. total number of genes on the chromosome
• C. recombination frequency between the genes
• D. order of the genes on the chromosome

Answer 1

The correct option is C recombination frequency between the genes

Recombination between linked genes can be used to map their distance apart on the chromosome. Recombination results when crossing over during meiosis separates linked genes. The unit of mapping (1 m.u.) is defined as a recombinant frequency of 1 percent. Centimorgan (cM)/ Map unit is the unit used to express the physical distance between the genes. 1cM equals 1% Recombination frequency. Thus we can calculate the map distance of genes on a chromosome, if we know the percentage of recombinants in the offspring.