Question

Pick the odd one out about linkage

• A. It is shown by genes present on the same chromosome
  
• B. Linked genes inherit together without any exception
• C. Smaller chromosomes have smaller linkage groups
• D. Linkage restricts recombination

Answer 1

The correct option is B Linked genes inherit together without any exception

Linked genes are the genes present on the same chromosome that tends to inherit together during the formation of gametes. But this group inheritance of genes has some exceptions during crossing over or recombination. If the two genes on the same chromosome are distantly located, then there is a fair chance of getting crossed over and mixing of genetic information. This is because distance between two linked genes is inversely proportional to the strength of the linkage. The set of all the genes that are present at different loci on the same chromosome constitute a linkage group. Smaller chromosomes have smaller linkage groups and larger chromosomes have larger groups.