Inheritance pattern of flower colour in garden pea plant and snapdragon differs why is the difference observed explain showing the cross upto f2 genration
Answers
Pea Plant
The offspring of F1, hereby known as F1 generation or F2, produced by crossing true-bred violet-flowered plants with true-bred white-flowered plants were all found to inherit the violet colour i.e. F1 generation was 100% violet flowers. The recessive white-colour trait of the parental generation was suppressed and the dominant violet-colour trait was established proving the law of dominance.
At the next attempt, two F2 hybrids were crossed to produce offspring plants, hereby known as the F2 generation. F2 generation had 75% of the dominant-trait violet flowers and 25% of the recessive-trait white flowers from the parental generation with the phenotypic ratio at 3:1, establishing the law of gametes.
Snapdragons
The offspring of F1, hereby known as F1 generation or F2, produced by crossing true-bred red-flowered plants with true-bred white-flowered plants were all found to inherit an intermediate pink colour i.e. F1 generation was 100% pink. This showed that there was no true dominance of the red trait and no true suppression of the white trait from the parental generation.
At the next attempt, two F2 hybrids were crossed to produce offspring plants, hereby known as the F2 generation. F2 generation had 25% red flowers and 25% white flowers like in the parental generation while the remaining 50% was pink flowers with a phenotypic ratio of 1:2:1, establishing incomplete dominance.
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