Asugar source, and are a sugar sink.

a) Al the offspring will have genotype - TtRrOo

b) Al the offspring will have genotype - TtRrOo

c) Tall, Red and Round

Explanation:

Given -

Red color of fruit is dominant to yellow color of fruit.

Round shape of fruit is dominant to pear shape of fruit

Also, Tall vine is dominant to dwarf vine

Crossing -  true-breeding tall plant bearing red round fruit (TTRROO) * true-breeding dwarf plant bearing yellow pear-shaped fruit (ttrroo)

a) Al the offspring will have genotype - TtRrOo

b) Al the offspring will have genotype - TtRrOo

c) Tall, Red and Round