EVERYDAY SCIENCE

Detailed explanation-1: -Epistasis occurs when a gene or gene pair suppresses or hinders the expression of another non-allelic gene. The gene that causes the effect is referred to as an epistatic gene, while the gene whose expression is inhibited is referred to as a hypostatic gene.

Detailed explanation-2: -D. Epistasis is the interaction between non allelic genes in which one gene masks, inhibit or suppresses the expression of other. So, the correct answer is ‘Epistasis’.

Detailed explanation-3: -Genes whose expression interferes with or masks the effects of other genes are said to be epistatic to the effected genes. Genes whose expression is affected (blocked or masked) are hypostatic to the interfering genes.

Detailed explanation-4: -Epistasis is the non-allelic gene interaction where the presence of one gene masks the expression of another gene; dihybrid ratio for dominant epistasis becomes 12:3:1.

Detailed explanation-5: -If the alleles are not aligned on the same locus of the homologous chromosome then it will be called a non-allelic gene. Examples: epistatic character, partial dominance are common characters observed mainly in the non-allelic genes.