If a tall red plant is crossed with a dwarf white plant and all offspring in the F1 generation are tall and red, what phenotypic ratio is expected when a test cross is performed?

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Three tall plants to one dwarf plantOne tall white to two intermediate to three dwarf redEqual proportions of tall red, tall white, dwarf red, and dwarf whiteOne tall to two intermediate to one dwarfNone of the above

Explanation

When the F1 generation consists entirely of tall red plants, it indicates heterozygosity for both traits. A test cross with a homozygous recessive individual will produce offspring in a 1:1:1:1 ratio, representing all possible combinations of the traits.