In the Jimson weed plant, purple flowers are dominant to white. When a particular purple-flowered jimson weed is self-fertilized, the progeny/offspring are 27 purple flowered and 10-white flowered progeny. (Hint: According to Mendelian Genetics, when is this ratio possible

Proportion of the true breed purple-flowered progeny will be

Explanation:

Complete Question

In jimsonweed, purple flowers are dominant to white. Self-fertilization of a particular purple-flowered jimsonweed produces 28 purple-flowered and 10 white-flowered progeny. What proportion of the purple-flowered progeny will breed true?

Solution

Given -

Purple flowers are dominant to white colored flowers

In self fertilization, purple-flowered jimsonweed produces 28 purple-flowered and 10 white-flowered progeny.

Let purple color flower be represented by "P" and white colored flowers be represented by "p"

Pp * Pp

PP, Pp, Pp, pp

one out of four offspring is purple true breed (PP) in terms of genotype

One (PP) of the three types of genotype (PP, Pp, pp) is true purple breed

Thus proportion of the true breed purple-flowered progeny will be