Question

Select the correct statement from the one's given below with respect to dihybrid cross.

• A. Tightly linked gene on the same chromosome show higher recombinations
• B. Genes for apert on same chromosomes show very few recombination
• C. Genes loosely linked on the same chromosomes show similar recombination as lightly linked ones
• D. Tightly linked genes on the same chromosomes show very few recombination

Answer 1

Answer: (D)

Tightly linked genes on the same chromosomes show very few recombination

• Recombination is the process of creating new arrangements of genes, either by crossing over or by independent segregation of homologous pairs of chromosomes.
• The frequency of cross over is directly proportional to the distance between two genes.
• Hence, the higher the recombination frequency the greater is the distance between the two genes.
• Genes that are present on the same chromosome and are tightly linked shows very few recombinations as they are linked genes.
• Whereas genes that are not close to each other or which are loosely linked shows a higher degree of recombination between them.

Thus, the correct answer is option D.