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Ornithophily

Question 2 Tw...

Question

Question 2
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be

(a) double fertilisation
(b) self pollination
(c) cross fertilisation
(d) no fertilisation

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Solution

(b) self-pollination

This question is a classic example for Mirabilis jalapa. In f2 crossing, incomplete dominance took place which results in 1 red, 2 pink and 1 white flower progeny.
Red - AA (Dominant)
White - aa (Recessive)

$F 1 \begin{matrix} A & A a & A a & A a a & A a & A a \end{matrix}$ Phenotype - All are Red

$F 2 \begin{matrix} A & A A & A A & A a a & a A & a a \end{matrix}$

Phenotype - 1 red, 2 pink and 1 white

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