8. A cross is made between two plants with white flowers. All the F1 progeny had red coloured flower. This is because of (1) complementation (2) recombination (3) translocation (4) […]
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CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Understanding Genetic Interaction: Identifying Synergistic Interaction in Plant Height Mutants
7. There are two mutant plants. One shows taller phenotype than wild type, whereas the other has the same height as the wild type. When these two mutations were brought […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
9:3:3:1 comb pattern in hens shows gene interaction for comb shape
A cross between hens with different comb shape was carried as shown in figure. The conclusion which can be drawn is (1) Single gene is involved for comb shape (2) […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
What Does a 1/16 Mutant Phenotype Proportion Indicate in Genetic Crosses?
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 […]
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 […]
