male dna

abnormal analyses biology biotechnology care cell cells chemistry chromosome close code concept conception count dimensional dna double egg elusive fastest female fertility fertilization gene genes genetic group health helix human icon infertile infertility information insemination intrauterine life male medical medicine men microbiology microscopic mitochondria new nucleus pregnancy problem problems quality reproduction sample science semen sex sexuality shaped sperm spermatozoa structure swimmer swimmers swimming symbol tail therapy three towards transfer with