Select the correct statement from the ones given below with respect to the dihybrid cross:
Correct answer: D. Tightly linked genes on the same chromosome show very few recombinations
- A. Tightly linked genes on the same chromosomes 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
- D. Tightly linked genes on the same chromosome show very few recombinations
Explanation
Linkage is the phenomenon of certain genes staying together during inheritance through generations without any change or separation due to their being present on the same chromosome. Linked genes occur in the same chromosome. The strength of the linkage between two genes is inversely proportional to the distance between the two i.e., two linked genes show a higher frequency of crossing over (recombination) if the distance between them is higher and a lower frequency if the distance is small.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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