Tag: CSIR NET Life Science Previous Year Questions and Solution Genetics

The following is the biochemical pathway for purple pigment production in flowers of sweet pea: Recessive mutation of either gene A or B leads to the formation of white flowers. […]

10. When two independent pure lines of pea with white flowers are crossed, the F1 progeny has purple flowers. The progeny obtained on selfing shows both pruple and white flower […]

9. Two mutant plants, both bearing white flowers, were crossed. All F1 plants had red coloured flowers. When an F1 plant was selfed it produced progeny with either red or […]

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) […]

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 […]

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) […]

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 […]

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 […]

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 […]

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          […]