If one of Mendel's genes had three alleles that differentially affected the phenotype rather than two, what would he have observed among the progeny of many crosses between all pairs of the three pure-breeding lines in the F1 and F2 generations?

Question

Comments: This case brings up the chance of codominance or incomplete dominance and
provides for multiple phenotypes among a large set of crosses. In any one cross, there
would be specific pure-breeding strains used, but there could be white, pink, and red flowers
that are all pure breeding that may have complete or incomplete dominance. The population
effects of this kind of genetics could move toward a broader range of phenotypes leading to
the idea of blending inheritance. Mendel's innovative idea was to narrow the traits to simple
binary phenotypes. This complication could show what could happen if he had not been so
thoughtful.
A. In each of the crosses, two phenotypes in
the F1 generation.
B. Only a single phenotype would be
observed in the F1 generation because only
one allele can be dominant.
C. No evidence would exist for the law of
segregation.
D. No pure breeding plants produced in the
F2.
E. None of the responses are correct.

Answer 1

E