Sorry. Heterozygous means that he two genes in the gene pair are not the same gene. They are different genes for that position (called alleles). For instance, silver & gold are alternative genes for a particular position they are alleles. If both the genes of the gene pair were gold the bird would be homozygous gold if the bird carried one gold gene & one silver gene the bird would be called heterozygous for silver & gold.
That wasn't the best example because they are sex linked genes but as we had been talking about silver/gold.....
Phenotype refers to what the creature (or plant) looks like; genotype refers to the actual genes carried by the creature (or plant)
Going back to your original question, the chicks from that mating will be basically Black, but may show a little colour (silver) in the neck hackles both,breast on pullet,and shoulders of cockerels.
The chick does nor look like a Silver Salmon,silver duckwing ,but more like a Wheaten.
David