In Figure 1.8(a),the chromosomes carrying allele A and the one carrying allele B move to the same pole while the chromosomes carrying allele a and the one carrying allele b move to the opposite pole.Cell 1 therefore contains the alleles A and B while cell 2 contains the alleles a and b.Dueyo to theorientation of homologous chromosomes in Figure 1.8(b),cell 3 contains the alleles A and b whereas cell 4 contains the alleles and B.