Which of the following stage of meiosis is responsible for deciding genetic constitution of gametes?

The correct option is D Anaphase-I
The paternal and maternal chromosomes of each homologous pair segregate during anaphase-I of meiosis. Although both (maternal and paternal) chromosomes of a homologous pair have the genes for the same traits, each chromosome of a pair may carry different alleles of the same genes. Therefore, in anaphase-I, homologous chromosomes introduce genetic variability and decide genetic constitution of gametes.