30.

When a homozygous purple-flowered pea plant is crossed to a homozygous white- flowered pea plant all progeny in the F1 generation are purple- flowered. When an F1 purple-flowered plant is back-crossed to the white- flowered parent, the expected phenotypic ratio of the progeny is

• a. all offspring white.
• b. all offspring purple.
• c. 1/2 offspring white, 1/2 offspring purple.
• d. 3/4 offspring white, 1/4 offspring purple.
• e. 1/4 offspring white, 3/4 offspring purple.