The types of gametes will be produced by a species of genotype TtRr are

The types of gametes will be produced by a species of genotype TtRr are TR, Tr, tR, tr.
All the offspring will be hybrid (heterozygous) tall, red flowering (TtRr). Since the genes for height are on a different pair of chromosomes from the genes for flower colour, the genes assort independently. This allows for four different types of "gametes" to form: TR, Tr, tR and tr.