Dihybrid cross: ratios and independent inheritance
This type of question, asked 4 times: 2022, 2024, 2025, 2026. All 5 questions below, oldest first.
Try each one first, then open its answer.
Question 1
2022
13How do Mendel’s experiments show that the traits are inherited independently ? Explain.Question 2
2024
10In an experiment to study independent inheritance of two separate traits : shape and colour of seeds, the ratio of the different combinations in progeny would beTap an option to check your answer.
Question 3
2025
32In one of Mendalian experiments, when generation pea plants with round yellow seeds were self-pollinated, pea seeds with the following combinations were obtained in generation :Analyse the result and describe the mechanism of inheritance of traits which explains the above results.Seeds Round yellow Round green Wrinkled yellow Wrinkled green Number 800 275 268 90 Question 4
2025
8A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The generation will beTap an option to check your answer.
Question 5
2026
13Use the following information for Pea plants : Dominant allele for tall plants – T Recessive allele for short plants – t Dominant allele for purple flowers – P Recessive allele for white flowers – p (a) Perform a cross between pure plant dominant for both the traits with another plant which is recessive for both the traits and work out the progeny upto generation. (b) What is the probability of obtaining tall plants with white flowers in progeny ?