5.In a certain genetic cross, 1/16 proportion of progeny shows mutant phenotype. It means (1) Two independent assorting genes are involved for trait (2) Two independently assorting duplicate genes are […]
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CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES (62)
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
How Many Genes Control the Trait in a 15:1 Phenotypic Ratio in Plants?
4. In a hybridization experiment a plant shows phenotypic ratio of 15:1. How many genes control the trait for observed phenotypic ratio? (1) One (2) Two (3) Three (4) Polygene […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
What does a 9:7 F₂ phenotypic ratio represent in genetics?
3. In a genetic test 9: 7 ratio in F2 generation represents (1) Epitasis (2) Co-dominance (3) Incomplete dominance (4) Complete dominance Explanation In a typical dihybrid cross with independent […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Understanding the F2 Phenotypic Ratio of Chicken Comb Shapes: Walnut, Rose, Pea, and Single Explained
2. F2 phenotype ration for comb shape in chicken was observed to be walnut, rose, peanut and single as 8:3:4:1. What is probable genotype of parents? (1) PPrr X PPrr […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Understanding the Dihybrid F2 Ratio 9:7 and Its Genetic Significance
1. The dihybrid F2 ratio 9:7 represents (1) Dominance (2) Independent assortment (3) Epistasis (4) Co-dominance Explanation of the Dihybrid F2 Ratio 9:7 The dihybrid F2 phenotypic ratio 9:7 is […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Why recessive lethal alleles persist in populations
Recessive lethal alleles are never completely eliminated from the population because: (1) lethal alleles are always conditional in nature. (2) lethal alleles have selective advantage. (3) they are maintained in […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Why rare red‑eyed males appear from crosses between two white mutants in Drosophila
24. Across is made between Drosophila stocks, each with an independent mutant allele, resulting in white eye color. The mutant alleles (named w1 and w2) are recessive. X- linked and […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Identifying bacterial strain and rII locus type from T4 plaque patterns
T4 phages were plated on three E. coli bacterial plateslabelled I,II and III. The phenotypes obtained aredepicted in the picture below. The black spotsrepresent plaques. The following combination of conditions […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Complementation and recombination of rII mutants a– and b– in T4 phage
22. Wild type T4 bacteriophage can grow on Band K strains of E. coli forming small plaques. rll mutants of T4bacteriophage cannot grow on E. coli strain K (non- permissive […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
How linkage is broken during prophase in Drosophila
21. upon studying a considerable number of different crosses in Drosophila, Morgan reached the conclusion that all genes of this fly were clustered into four linked groups corresponding to the […]
