alleryA tall pea plant is crossed with a dwarf plant. Half the offspring are tall and half are dwarf. The genotype of the tall parent must be
ATt (heterozygous)
BTT (homozygous dominant)
Ctt (homozygous recessive)
Dindeterminable from the data
Answer & Solution
Correct answer: A. Tt (heterozygous)
If the tall parent were TT, all offspring of TT × tt would be Tt (tall).
A 1:1 tall:dwarf ratio in the test cross means the tall parent contributed both T and t gametes — it must be Tt.
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