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Give a genetic explanation for the following cross. When a tall pea plant with round seeds was crossed with a dwarf pea plant with wrinkled seeds then all the individual of F1 - population were tall with round seeds. However selfing among F1 - populations led to a 9:3:3:1 phenotypic ratio.
Answers (1)
Tall Round Dwarf wrinkled
TTRR ttrr
TR tr
F1 genotype
TtRr
Self cross
TtRr X TtRr
| TR | Tr | tR | tr | |
| TR |
TTRR Tall Round |
TtRr Tall Round |
TtRR Tall Round |
TtRr Tall Pound |
| Tr |
TTRr Tall Round |
TTrr Tall Wrinkled |
TtRr Tall Round |
Ttrr Tall Wrinkled |
| tR |
TtRR Tall Round |
TtRr Tall Round |
ttRR Dwarf Round |
ttRr Dwarf Round |
| tr |
TtRr Tall Round |
Ttrr Tall wrinkled |
ttRr Dwarf Round |
ttrr Dwarf wrinkled |
Phenotypic ratio:
| Tall Round | Tall Wrinkled | Dwarf Round | Dwarf Wrinkled |
| 9 : | 3: | 3: | 1 |
Law of dominance
In a dissimilar pair of factors, one member of the pair is dominant and the other is recessive.
In the given cross tall and round are dominant whereas dwarf and wrinkled are recessive.
Law of Segregation:
Allelic pairs separate or segregate during gamete formation and the paired condition is restored during fertilisation.
Law of Independent Assortment:
The new combination is seen in F2 generation (Tall Wrinkled) (Dwarf Round) is only possible when the two gene pairs for height and seed shape independently of each other during gamete formation.
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