Question

In Red-White flowered cross of Mirabilis jalapa, $F_2$ generation has red, pink and white flowered plants in the ratio of

• A. 1 : 2 : 1
• B. 1 : 0 : 1
• C. 2 : 1 : 1
• D. 1 : 1 : 2.

Answer 1

Answer: (A)

1 : 2 : 1

A red flowered Mirabilis Jalapa(RR) is crossed to white flowered Mirabilis Jalapa(rr). The F1 individuals are Pink flowered(Rr). When F1 individuals are self crossed, in the F2 generation, 1 plant with red flowers(RR), 2 plants with pink flowers(Rr), 1 plant is with white flowers(rr) are formed. The phenotypic ratio is 1:2:1 and genotypic ration is 1:2:1.

So, the correct option is ‘1:2:1’.