A cross between a homozygous recessive and a heterozygous plant is called

For understanding the genotype of an offspring which cross should be performed

Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called

Heterozygous purple flower is crossed with recessive white flower. The progeny has the ratio

Self pollination between $Tt$ and $Tt$ plants results into genotype ratio of