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 different loci
- D. Different genes occupying the same locus
Explanation
Epistasis is an interaction between different genes at different loci, where one gene (epistatic) can modify or mask the expression of another gene (hypostatic), leading to phenotypic expressions that differ from those expected by considering each gene independently. Option B correctly identifies this inter-gene interaction. Option A incorrectly focuses on allelic interactions within the same gene. Option C incorrectly suggests the same gene can exist at different loci, which is not possible. Option D describes a situation involving allelic interactions or mutations, not the inter-locus gene interaction seen in epistasis.
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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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