Question

define and design a test-cross ?​

Answer 1

Explanation:

A cross between two pure breeding tall (TT) and dwarf (tt) varieties gives all tall F1 progeny. To test genotype of F1 progeny, it is crossed with pure breeding dwarf plant and obtains tall and dwarf progeny in a 1: 1 ratio suggesting the tested dominant variety is heterozygous.

Answer 2

Answer:

A cross between two pure breeding tall (TT) and dwarf (tt) varieties gives all tall F1 progeny. To test genotype of F1 progeny, it is crossed with pure breeding dwarf plant and obtains tall and dwarf progeny in a 1: 1 ratio suggesting the tested dominant variety is heterozygous.