Question

If plants that are tall are crossed with plants that are short and the next generation produces all tall plants, the most likely explanation is that...

Answer 1

a, the allele for tall is dominant to the allele for short.
b, the allele for short is dominant to the allele for tall.
c, the gene for plant height shows co-dominance.
d, the plants mutated.

Answer 2

a) if one trait "overcomes" another completely with no individuals showing the other trait, it is most likely dominant.