Two Pure-Breeding Phlox Plants Were Crossed, One with Dark-Blue Flowers

question 19

Multiple Choice

Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pink flowers. The F1 generation all had dark-blue flowers. When the F1 were crossed with each other, the F2 generation consisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, and 10 with pink flowers
-How is flower color controlled in phlox?

• A)one gene with four alleles
• B)one gene with two codominant alleles
• C)two genes whose alleles interact additively
• D)two genes with dominant epistasis

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