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| parthenogenesis binary fission sexual reproduction asexual reproduction gamete haploid 1n diploid 2n budding ascus meiosis fertilization alternation of generations sporophyte gametophyte zygote conjugation sex pilus mating type germ cell gametogenesis reduction division equational division homologous pair autosome sex chromosome homolog synapsis chiasmata crossing over allele sibling independent assortment sperm spermatogenesis spermatogonium primary spermatocyte secondary spermatocyte spermatid spermatozoa acrosome seminiferous tubule testes epididymis vasa deferentia urethra semen ejaculation oogenesis oogonium primary oocyte polar body secondary oocyte ovum ovary follicle uterine tube zygote puberty ovulation menstruation artificial insemination surrogate gestation in vitro fertilization ICSI GIFT ZIFT menopause |