Question

A white-flowered Mirabilis plant (rr) was crossed with a red color flowered plant (RR). If 120 plants are produced in $F_2$ generation, the result would be

• A. 90 Red and 30 white
• B. 30 red and 60 pink and 30 white
• C. 60 pink and 60 white
• D. 30 red and 30 pink and 90 white

Answer 1

The correct option is B 30 red and 60 pink and 30 white

The phenotypic and genotypic ratio of $F_2$ generation is (1RR: 2Rr: 1rr)
Total 120 plants are produced in $F_2$.
So, out of 120 plants, 2 parts are pink, 1 part is red, and the remaining 1 part is white i.e., 60 plants are pink, 30 are red and 30 are white.