XY system
(biology) The system that determines the sex of humans, most other mammals, some insects (Drosophila), and some plants (Ginkgo), in which females have two of the same kind of sex cell (XX) and males have two distinct sex cells (XY).
plural of spoiler effect
present participle of rivel
plural of ting
性決定を研究する研究者は、ヒトや多くの他の種で、雄が異なる性染色体（X染色体とY染色体）を持つ雄ヘテロガメティックな染色体性決定機構が雄と雌の発生を決める仕組みであるとよく述べる。
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