gametogenesis species/genus/family/order/class/phylum school biology semen penis and associated glands. urethra ejaculatory duct vas deferens epididymis testis yolk morula nucleocytoplasmic ratio klinefelter syndrome turner syndrome down syndrome cooley's disease beta thalassemia alpha thalassemia ovarian cycle uterine cycle haemophilia x-linked sex linkes inheritance x-linked genes haplodiploid sex genic balance zz male and zw female xx female and xy male cleavage fertilization bhaskar gouda
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