Chapter:

Principles-of-Inheritance-and-Variation

Fruit shape in shephered's purse(capseila bursa) is of two types- triangular and top-shaped. Triangular fruit shape(T) is dominant over top-shape(t). Following table summaries results of several crosses.
CrossResult
Strain ttAll triangular
Strain tt triangular top-shaped
Strain ttAll top-shaped
Strain tt triangular top-shaped
Which pair of strains possess genotype Tt?