High importanceUsually 2 marks a paper · mostly case-based questions and MCQs · asked in 4 of the last papers
The board questions below are real and complete — they come from the CBSE papers themselves. The written notes for this topic are still being prepared.
7 from the CBSE papers we hold — the exact wording the board used.
Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds were crossed with each other which produced F_1 progeny that have only round yellow (RrYy) seeds. When F_1 plants are self-pollinated, the F_2 progeny will have which new combination of characters, as compared to the parents: (i) Round, yellow (ii) Round, green (iii) Wrinkled, yellow (iv) Wrinkled, green. Correct options are:
If pea plants with round and green seeds (RRyy) are crossed with pea plants having wrinkled and yellow seeds (rrYY), the seeds developed by the plants of F_1 generation will be :
Mendel's experiments on inheritance in garden pea.
Write one difference between dominant and recessive trait.
Mendel's experiments on inheritance in garden pea.
In a cross with two pairs of contrasting characters RRYY x rryy (Round Yellow) (Wrinkled Green), Mendel observed 4 types of combinations in F_2 generation. By which method did he obtain F_2 generation? Write the ratio of the parental combinations obtained and what conclusions were drawn from this experiment.
Mendel's pea-plant cross experiment tracing inheritance of traits.
Differentiate between dominant and recessive traits.
dihybrid cross round-yellow x wrinkled-green pea plants with new combinations appearing in F_2.
State the ratio of the combinations observed in the seeds of F_2 generation (in the above case). What do you interpret from this result?
(i) In a cross between violet flowered plants and white flowered plants, state the characteristics of the plants obtained in the F_1 progeny. (ii) If the plants of F_1 progeny are self-pollinated, then what would be observed in the plants of F_2 progeny? (iii) If 100 plants are produced in F_2 progeny, then how many plants will show the recessive trait?