Question

In four-o'clock plants, red flower color is dominant to white flower color. However, heterozygous plants have a pink color. If a pink-flowered plant is crossed with a white-flowered plant, what will be the phenotypic ratios of their offspring?a. $\frac{1}{4}$ red, $\frac{1}{2}$ pink, $\frac{1}{4}$ white
b. All pink
c. All white
d. $\frac{1}{2}$ pink, $\frac{1}{2}$ white
e. $\frac{1}{2}$ red, $\frac{1}{2}$ pink

Answer 1

Answer: Option D) 1/2 pink, 1/2 white

Explanation:

For the four 'o' clock plant, let YY represent Red; Yy for pink; yy for white

So, the cross of the pink with white is known as TEST CROSS, and it gives:

Yy X yy

"Y","y" X "y" = F1 will be Yy and yy

From the test-cross, the phenotypic ratio of the first filial generation is 1/2 pink, 1/2 white i.e 50% pink and 50% white