Question

Which of the following events is/are less likely to occur in case of genes located in proximity to each other on the same chromosome?

I. Linkage
II. Recombination
III. Crossing over
IV. Dominance

• A. I and IV only
• B. I, II, and III
• C. II, III, and IV
• D. II and III only

Answer 1

The correct option is D II and III only

Genes which are located in proximity to each other tend to exhibit physical association which is scientifically termed as linkage.
Crossing over refers to the exchange of genetic materials between non-sister chromatids of homologous chromosomes. Recombination refers to the appearance of new combinations which are different from parental combinations. In case of genes which are located in close proximity to each other, crossing over and recombination is less likely to occur.
The concept of dominant and recessive is usually considered between 2 alleles of a gene, not between 2 genes.