Question

Lack of independent assortment between two genes A and B would be due to

• A. Crossing over
• B. Linkage
• C. Recombination
  
• D. None of the above

Answer 1

The correct option is B Linkage

Crossing over is the process of exchange of genetic material between non-sister chromatids of homologous chromosomes to produce new genetics combinations or variations; it does not interfere with an independent assortment of genes. Option A is incorrect. The linkage is the tendency of closely placed genes on a chromosome to stay together during inheritance and do not assort independently; it produces more parental combination and less/no new combinations of the gene. The linkage is indirectly proportional to the distance between genes; the less the distance between the genes, the more linkage due to lack of independent assortment between them. Option B is correct. Recombination is new arrangements of genes on chromosomes which is carried out by independent assortment and crossing over; thus recombination is the result of independent assortment which makes option D is incorrect. Option B is correct.