Create a clear educational biology diagram that starts with the human body silhouette and shows two branches: one focusing on a random organ (e.g., heart) leading to tissue → cell → nucleus → chromosomes (46, 23 homologous pairs) → DNA → genes → alleles. The second focusing on a sexual organ (e.g., ovary/testicle) leading to tissue → cell → nucleus → chromosomes (23). Then show the process of meiosis with all phases (prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, telophase II) creating 4 haploid gametes. Show fertilization between opposite sex gametes and early embryonic development. Add labels, arrows connecting each step, clean scientific diagram style.”