Question

YY AND TT and Tt and Yy responsible for

Answer 1

These are traits used by scientist G.J. MENDEL to determine the characters of the dominant and recessive plants.

Hope this helps..

Answer 2

YY is responsible for yellow seed colour.
TT is responsible for tallness of plant.
Yy is responsible for heterozygous yellow seed colour
Tt is responsible for heterozygous yellow seed colour plant