When two or more genes interact in a way that their effect is additive expression, it is;
Correct answer: B. Polygenic inheritance
- A. Co-dominance relation
- B. Polygenic inheritance
- C. Epistasis
- D. Incomplete dominance
Explanation
Polygenic refers to a trait that is controlled by multiple genes. Such traits are often influenced by the interaction of many genes and environmental factors. In polygenic inheritance, the effect of each gene is additive, meaning that the more genes an individual has for a particular trait, the greater the expression of that trait. For example, human height is a polygenic trait that is influenced by the interaction of many genes. Hence, option B is correct.
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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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