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

1/3

Explanation:

Let's assume that the allele "P" imparts purple phenotype to flowers while the allele "p" gives white phenotype. The self-fertilization of purple-flowered parent plants gave purple and white progeny in almost 3:1 (28:10) ratio. This means that the parent plants were heterozygous and the genotype of each was "Pp".

A cross between Pp and Pp produces progeny in the following genotype ratio=

1/4 PP: 1/2 Pp: 1/2 pp

So, out of total 3/4 purple progeny, 1/3 is homozygous for the purple allele (PP) while the rest 2/3 is heterozygous dominant.

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