Select the correct statement from the ones given below with respect to dihybrid cross.
Select the correct statement from the ones given below with respect to dihybrid cross.
(a) Tightly linked genes on the same chromosome show higher recombinations
(b) Genes far apart on the same chromosome show very few recombinations
(c) Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones
(d) Tightly linked genes on the same chromosome show very few recombinations
3 Answers
Correct option (d) Tightly linked genes on the same chromosome show very few recombinations
Explanation
Morgan and his group found that when genes were grouped on the same chromosome, some genes were very tightly linked (showed very low recombination), while others were loosely linked (showed higher recombination). Recombination is a process of rearrangement of genes during meiosis so that a gamete contains a haploid genotype with a new gene combination.
Correct option: (d) Tightly linked genes on the same chromosome show very few recombinations
Explanation:
Linkage is the inheritance of genes of same chromosome together and capacity of these genes to retain their parental combination in subsequent generation. The strength of linkage between two genes is inversely proportional to the distance between the two. This means, two linked genes show higher frequency of recombination if the distance between them is higher and lower frequency if the distance is smaller.