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 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 moderate recombinations
- D. Tightly linked genes on the same chromosome show very few recombinations
Explanation
Linkage refers to the tendency of genes located close to each other on the same chromosome to be inherited together during meiosis. The closer two genes are, the less likely they are to be separated by crossing over, resulting in fewer recombinations. Tightly linked genes, therefore, exhibit very few recombinations, as stated in Option D, which is the correct answer. Options A and B are incorrect because they inaccurately describe the relationship between gene distance and recombination frequency. Option C is partially correct but lacks specificity regarding the variability of recombination rates based on gene distance.
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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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