What types of male and female gametes were formed by crossing heterozygous plants?

Organisms are called heterozygous if the genotype combines genes for dominant and recessive traits.
For example, the gene for the dominant trait is denoted C, the gene for the recessive trait is c. A heterozygous plant will have the Cc genotype.
Such plants are capable of producing germ cells of two types – C and C, that is, both gametes containing the dominant C gene and gametes containing the recessive gene c.