✓ Board-verified
Science · 2022 · 3 marks
CBSE 2022 · Region 2 · Set 2 · Q11
A green stemmed tomato plant denoted by (GG) is crossed with a tomato plant with purple stem denoted by (gg). (i) What colour of the stem would you…
A green stemmed tomato plant denoted by (GG) is crossed with a tomato plant with purple stem denoted by (gg).
(i)
What colour of the stem would you expect in their F1 progeny ?
(ii)
In what ratio would you find the green and purple coloured stem in plants of F2 progeny ?
(iii)
What conclusion can be drawn for the above observations ?
Marking-scheme solution
(i)
Green
(ii)
Green stem : Purple stem
\[3 \text { : } 1
\]
(iii)
Conclusion: In two contrasting characters or alternative forms one of the forms is dominant over the other which is recessive. / Green stem colour is dominant over purple stem / dominant traits are expressed in the presence of recessive trait.
More from Heredity
- Assertion: In human beings, males have 'XX' sex chromosomes and females have 'XY' sex chromosomes. Reason (R): Sex of the child is determined at the…2024
- In human beings, there are 23 pairs of chromosomes. Out of these 23 pairs of chromosomes (i.e. 46 chromosomes), 22 pairs of chromosomes are called…2025
- Explain how the proteins control the 'characteristics' in an organism with the help of an example of 'short height' trait in pea plant. Name the…2025
- 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…2026
- In an experiment to study independent inheritance of two separate traits: shape and colour of seeds, the ratio of the different combinations in F_2…2024
- Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular trait in each generation. He…2022
- "In human beings the genes inherited from the parents decide whether the newborn individual is male or female." Explain this statement with the help…2025
- List two differences between dominant traits and recessive traits. What percentage of pea plants in the F_2 generation were with yellow seeds in…2024
CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.