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瓜地惊现“合体瓜” 上半身是西瓜下半身是冬瓜
9月12日，甘肃平凉，一位女子在自家西瓜地劳作时，意外发现两个外形奇特的“合体瓜” 。
这两个瓜的上半部分呈现西瓜特征，深绿与浅绿相间的条纹清晰可见；下半部分则是冬瓜形态，表皮覆盖白色粉霜。两种特征自然衔接，仿佛天生一体。
女子表示，这是自然变异生成的，自己种了十几年西瓜第一次见。
农科院专家推测，这种“合体瓜”可能是自然嫁接或基因杂交所致。西瓜藤与冬瓜藤在生长过程中若发生擦伤，可能形成细胞融合，形成共生体。但这种现象成功率比中彩票还低，需满足特定环境条件（如藤蔓擦伤、细胞再生能力等）。 两者基因虽相近，但遗传物质差异导致形态分化。例如西瓜纹路由染色体排列决定，而冬瓜外皮特征由另一套基因控制。当基因发生嵌合时，可能出现纹路与外皮特征混合的现象。
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