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Biology · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 2 · Q22
With reference to flower colour two independent crosses were made, one between true breeding garden pea plants and another between true breeding…
With reference to flower colour two independent crosses were made, one between true breeding garden pea plants and another between true breeding Antirrhinum plants. Write the phenotypes of their $\displaystyle \mathrm{F}_{1}$-progeny. Justify your answer giving reason.
Marking-scheme solution
Garden pea (complete dominance): PP (Violet) × pp (White) → Pp — all purple flowers. Antirrhinum / snapdragon (incomplete dominance): RR (Red) × rr (White) → Rr — all pink flowers. The F₁ phenotypes differ because pea shows complete dominance while Antirrhinum shows incomplete dominance.
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