Suppressor Mutation: A second mutation occurring at a distinct site from the primary mutation that partially or completely reverses or compensates for the mutant phenotypic effect, restoring the wild-type phenotype:
Intragenic Suppressor: Occurs within the same gene (compensatory frameshift or secondary structure restoration).
Intergenic / Extragenic Suppressor: Occurs in an entirely different gene (e.g., mutant tRNA reading through a nonsense codon).
Correct Option: Option 3 (suppressor mutation).
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Q.33
Fish Physiology and Biochemistry- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
From the following list of tagging methods, which is incorrect for fish?
Dye Marking: Subcutaneous injection of Alcian blue or fluorescent elastomer tags.
Fin Clipping: Simple, non-destructive surgical marking.
Metal Tagging: External strap, jaw, or opercular metal tags are outdated and problematic in fisheries; they corrode, cause severe mechanical tissue tearing, fungal infection, and alter natural swimming and feeding behavior.
Correct Option: Option 3 (Metal tagging).
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Q.34
Fish Physiology and Biochemistry- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
As per IUCN list of threatened species, Tor putitora, Tor malabaricus and Tor khudree are—
Genomic Imprinting: An epigenetic phenomenon where the expression of a gene is determined by its parental origin (monoallelic parent-of-origin specific expression) through DNA methylation and histone modifications.
Because expression depends on whether the allele is inherited from the mother or father, it violates standard Mendelian inheritance rules (which assume equal expression regardless of parent of origin).
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