The phenotype short in pea plants is expressed by which allele combination?
tt
In Mendel's classical pea-plant experiments, height is controlled by a single gene with two alleles: T (tall) which is dominant and t (short) which is recessive.
A recessive phenotype is expressed only when both alleles carry the recessive form, i.e. the plant is homozygous recessive.
Combinations TT and Tt both contain at least one dominant T allele, so those plants appear tall; only tt produces the short phenotype.
Hence, the short phenotype in pea plants is expressed by the allele combination tt.
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