Epistasis is an interaction between:
Correct answer: B. Different genes occupying different loci
- A. Different alleles of the same gene
- B. Different genes occupying different loci
- C. Same gene of the different loci
- D. Different genes occupying same locus
Explanation
Epistasis is an interaction between different genes at different loci (specific positions on a chromosome). It occurs when the expression of one gene affects the expression of another gene, often at a different locus, leading to a modified or masked phenotype. In epistasis, one gene is said to be epistatic, while the gene whose effect is modified or masked is termed hypostatic. Epistasis can result in various patterns of inheritance and contribute to the complexity of genetic traits observed in populations.
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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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