Question 14 Marks
A student crossed pea plants having round and yellow seeds with pea plants having wrinkled and green seeds. He found that only one type of seeds were produced in the $F_{1}$ generation. When these $F_{1}$ generation pea plants were self - pollinated with each other, then in addition to the seed type of $\mathrm{F}_{1}$ generation, some new types of seed combinations were also obtained in the $\mathrm{F}_{2}$ generation.
i. Write any two contrasting visible characters other than the ones shown above, taken by Mendel for his experiment.
ii. Mention the dominant traits observed in $\mathrm{F}_{1}$ generation.
iii. Give reason why the traits which were not visible in the seeds of $F_{1}$ generation reappeared in the seeds of $F_{2}$ generation. Write the ratio of different types of seeds obtained in $\mathrm{F}_{2}$ generation in this case.
OR
What is meant by the terms (I) dominant, and (II) recessive traits? Explain.
i. Write any two contrasting visible characters other than the ones shown above, taken by Mendel for his experiment.
ii. Mention the dominant traits observed in $\mathrm{F}_{1}$ generation.
iii. Give reason why the traits which were not visible in the seeds of $F_{1}$ generation reappeared in the seeds of $F_{2}$ generation. Write the ratio of different types of seeds obtained in $\mathrm{F}_{2}$ generation in this case.
OR
What is meant by the terms (I) dominant, and (II) recessive traits? Explain.
Answer
View full question & answer→i. (i) Flower color (purple or white)
(ii) Plant size (tall or dwarf)
ii. In $\mathrm{F}_{1}$ generation round and Yellow seeds were observed that mean round and Yellow are dominant traits.
iii. The traits which were not show in $\mathrm{F}_{1}$ generation were recessive traits that do not show their presence in front of dominant genes.
Ratio of types if seeds in $F_{2}$ generation is $9: 3: 3: 1$
OR
I. The trait that first appears or is visibly expressed in the organism is called the dominant trait.
II. The trait that is present at the gene level but is masked and does not show itself in the organism is called the recessive trait.
(ii) Plant size (tall or dwarf)
ii. In $\mathrm{F}_{1}$ generation round and Yellow seeds were observed that mean round and Yellow are dominant traits.
iii. The traits which were not show in $\mathrm{F}_{1}$ generation were recessive traits that do not show their presence in front of dominant genes.
Ratio of types if seeds in $F_{2}$ generation is $9: 3: 3: 1$
OR
I. The trait that first appears or is visibly expressed in the organism is called the dominant trait.
II. The trait that is present at the gene level but is masked and does not show itself in the organism is called the recessive trait.