【科学60秒】最甜蜜的水果不再遥不可及！_英语听力练习mp3下载-科学-沪江听力酷

后台管理反馈贡献

【科学60秒】最甜蜜的水果不再遥不可及！

听力简介：

Mark Twain called it “the most delicious fruit known to men.” He was talking about the cherimoya. If you never heard of it, there’s good reason. It has a feature that has prevented it from becoming ____1____—numerous big seeds fill its sweet white flesh.
But now scientists in Spain and at the University of California, Davis, have found the key to making the cherimoya and related fruits seedless. They published their research in the Proceedings of the National Academy of Sciences.
____2____develop a seedless fruit—bananas and oranges are rare successes. Breeding for seedlessness usually fails to produce the fully developed fruit consumers demand. But the scientists found ____3____that causes seedlessness in a cherimoya relative, the sugar apple. They compared its genome to that of a seedless mutant of a plant called Arabidopsis that’s used in a lot of research.
In both cases, they found a ____4____of one particular gene. The researchers say this is the first time a gene for seedlessness has been determined. If they can find a way to knock out that gene in the cherimoya, it could bring Mark Twain’s favorite fruit, and many others, to a ____5____near you.
【视听版科学小组荣誉出品】