Question 14 Marks
Refer to the given table regarding results of $\mathrm{F}_{2}$ generation of Mendelian cross.
i. What would be the phenotype of $F_{1}$ generation regarding given data of $F_{2}$ generation?
ii. What would be the genotype of parental generation regarding the given result of $\mathrm{F}_{2}$ generation?
iii. If a plant with wrinkled and green coloured seeds $(\mathrm{S})$ is crossed with the plant having wrinkled and yellow coloured seeds (R), what will be the probable phenotype of offspring?
OR
What will result when plant YyRr is self-pollinated?
| Plants with round and yellow coloured seeds (P) | 315 |
| Plants with round and green coloured seeds (Q) | 108 |
| Plants with wrinkled and yellow coloured seeds (R) | 101 |
| Plants with wrinkled and green coloured seeds (S) | 32 |
i. What would be the phenotype of $F_{1}$ generation regarding given data of $F_{2}$ generation?
ii. What would be the genotype of parental generation regarding the given result of $\mathrm{F}_{2}$ generation?
iii. If a plant with wrinkled and green coloured seeds $(\mathrm{S})$ is crossed with the plant having wrinkled and yellow coloured seeds (R), what will be the probable phenotype of offspring?
OR
What will result when plant YyRr is self-pollinated?
Answer
View full question & answer→i. Plants with round and yellow coloured seeds.
ii. YYRR and yyrr
iii. Plant with wrinkled and green coloured seeds (S) (genotype rryy) is crossed with plant with wrinkled and yellow coloured seeds (R) (genotype rrYY or rrYr). If plant with wrinkled and green coloured seeds (rryy) is crossed with plant having wrinkled and yellow coloured seeds of genotype rrYY then all plants produced with wrinkled and yellow coloured seeds whereas if plant with wrinkled and green coloured seeds (rryy) is crossed with plant having wrinkled and yellow coloured seeds that has genotype rrYy then $50 \%$ plants with wrinkled and yellow coloured seeds and $50 \%$ plants with wrinkled and green coloured seeds are produced.
OR
$9: 3: 3: 1$ ratio of phenotypes only
The transfer of pollen grains from the anther to the stigma of the same flower or another flower on the same plant is known as self-pollination.
ii. YYRR and yyrr
iii. Plant with wrinkled and green coloured seeds (S) (genotype rryy) is crossed with plant with wrinkled and yellow coloured seeds (R) (genotype rrYY or rrYr). If plant with wrinkled and green coloured seeds (rryy) is crossed with plant having wrinkled and yellow coloured seeds of genotype rrYY then all plants produced with wrinkled and yellow coloured seeds whereas if plant with wrinkled and green coloured seeds (rryy) is crossed with plant having wrinkled and yellow coloured seeds that has genotype rrYy then $50 \%$ plants with wrinkled and yellow coloured seeds and $50 \%$ plants with wrinkled and green coloured seeds are produced.
OR
$9: 3: 3: 1$ ratio of phenotypes only
The transfer of pollen grains from the anther to the stigma of the same flower or another flower on the same plant is known as self-pollination.