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Normally, wild violets have yellow petals with dark brown markings and erect stems. Imagine you discover...

Normally, wild violets have yellow petals with dark brown markings and erect stems. Imagine you discover a mutant plant with white petals, no markings, and prostrate stems.

Assume that the mutant phenotypes are due to the pleiotropic effects of a single gene where the wild-type allele is completely dominant to the mutant allele. If you cross the pure-breeding wild-type violets with the pure-breeding mutant violets and self the F1, how many different phenotypic classes will you have in the F2 generation?

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Answer #1

Wild type = AA, Aa

Mutant = aa

AA × aa = Aa = F1 = all wild type

Aa × Aa

Gametes A a
A AA normal Aa normal
a Aa normal aa mutant

F2 = 3 (wild type) : 1 (mutant)

There will be 2 phenotypic classes, wild type and mutant.

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