Ratio of complementary genes is:
Correct answer: D. 9 : 7
- A. 9 : 3 : 4
- B. 12 : 3 : 1
- C. 9 : 3 : 3 : 1
- D. 9 : 7
Explanation
The correct answer is 9 : 7 (Option D). Complementary gene interaction occurs when two different genes work in tandem, with the presence of at least one dominant allele from each gene necessary for the expression of a specific trait. This results in a phenotypic ratio of 9 : 7. Other options such as 9 : 3 : 4, 12 : 3 : 1, and 9 : 3 : 3 : 1 represent different types of genetic interactions or inheritance patterns, like epistasis and Mendelian dihybrid crosses, but do not pertain to complementary gene interactions.
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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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