Question

Pick the correct option with respect to the linkage and recombination.

• A. Tightly linked genes on the same chromosomes show a higher recombination frequency
• B. Genes far apart on the same chromosome show very few recombinations
  
• C. Genes loosely linked on the same chromosome show very few recombinations
• D. Tightly linked genes on the same chromosome show very few recombinations
  

Answer 1

The correct option is D Tightly linked genes on the same chromosome show very few recombinations


Linkage is the association of genes, it is the phenomenon of certain genes on a chromosome to stay together and inherit together from generation to generation without following the law of independent assortment.

Recombination is the sorting of alleles into new combinations other than the parental combination due to crossing over. The distance between the genes plays an important role in the strength of the linkage. If the distance between them is far enough for cross over then the strength of the linkage will be less and vice versa.

Closely situated genes on a chromosome show a tight linkage between them and hence recombination is low. Loosely linked genes show more recombinations as the distance between the genes on the chromosomes is great and crossing over occurs easily.