sperm with ovum

and biological biology cell concept egg embryogenesis embryology fecundation fertile fertility fertilization fertilize gamete genes genetic genetics human impregnation insemination intercourse ivf medical medicine micro microscope microscopic nucleus oocyte ovulation ovule ovum penetration pregnancy procreation rendering reproduction research science semination sperm spermatozoa spermatozoid spermatozoon vitro zygocyte zygote