Seeds of Some Lentils Are Speckled

Multiple Choice

Seeds of some lentils are speckled.A true breeding strain with small speckles is crossed with a true breeding strain with large speckles.All of the F1 progeny have both large and small speckles.Which of the following is true?

A) The trait is controlled by two genes and the alleles are co-dominant
B) The trait is controlled by one gene and the alleles are co-dominant
C) The trait is controlled by two genes and the alleles are incompletely dominant
D) The trait is controlled by one gene and the alleles are incompletely dominant
E) The trait is controlled by one gene and both alleles are dominant