正确答案: D

两性植株群体内随机传粉.产生的后代中，纯合子比例高于杂合子

题目：喷瓜有雄株、雌株和两性植株.G基因决定雄株.g基因决定两性植株。 基因决定雌株。G对g、 是显性。g对 是显性.如：Gg是雄株.g 是两性植株.g 是雌株。下列分析正确的是

解析：D

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举一反三的答案和解析：

[单选题]EThe need to feed a growing population is putting much pressure on the world’s supply of water. With 97% of the world’s water too salty to be drunk or used in agriculture, the worldwide supply of water needs careful management, especially in agriculture. Although the idea of a water shortage（短缺）seems strange to someone fortunate enough to live in a high rainfull country, many of the world’s agricultural industries experience constant water shortages.

the costs of water redistribution should be considered

[单选题]46______

allow