Examine the Punnett square below, for the cross between the following individuals (assume complete dominance)

What do the letters Q and represent at the top of the Punnett square?

The allele for a single gene on one chromosome in potential haploid cells

The alleles for a single gene found on one chromosome in potential zygotes The alleles for two different genes found on two different chromosomes in a potential haploid cell The alleles for a single gene found on two homologous chromosomes in a diploid

cell The alleles for two different genes found on two homologous chromosome in potential diploid cells