fertilization. fertilisation from egg plus sperm to zygote and embryo

fertilization fertilisation zygote egg sperm embryo fusion haploid gamete diploid vector biology education diagram human reproductive process fertility pregnancy nucleus health development fertile ovulation gynecology female medicine anatomy genetic stage embryology structure follicle oocyte woman infertility insemination spermatozoon care scientific healthy medical science exam knowledge lesson explainer biochemistry quiz instruction learning training schooling teaching coaching fertilization plus fertilisation sperm two gametes form embryo reproduction