Question

You perform a testcross on a tall pea plant. Half the offspring are short. What conclusion can you draw from this outcome?

A.) A change in the gene’s DNA changed the form of the trait.
B.) The genotype of the tall pea plant is heterozygous.
C.) The tall pea plant was crossed with a heterozygous plant.
D.) The genotype of the tall pea plant is homozygous.

Answer 1

B)

P generation - Tt × tt
F1 generation - Tt, Tt, tt and tt

Half will be heterozygous tall and half will be homozygous dwarf.