Question

Incomplete dominance ratio of red, pink and white in Four O'clock is

• A. 1 : 2 : 1
• B. 1 : 1 : 2
• C. 1 : 2 : 2
• D. 2 : 2 : 1

Answer 1

The correct option is A 1 : 2 : 1

In Mirabilis jalapa, flower colour shows incomplete dominance. The F1 plant obtained by the crossing of pure Red flowered plant(RR) with pure white flowered plant(rr) shows pink flowers(Rr). This F1 plant(Rr) is crossed is with pure red flowered plant(RR), in the next generation 2 plants with red flowers and 2 plants with pink flowers are formed. The phenotypic ratio is 1:2:1 and genotypic ratio is 1:2:1

So, the correct option is ‘1:2:1’.