“种瓜得瓜,种豆得豆”,是人类长期实践而形成的谚语。这句谚语的意思是:种瓜即可得到性状相似的瓜,种豆即可得到性状相似的豆。如播种西瓜即可收获西瓜;如播种蚕豆,即可收获蚕豆。形成这样的谚语还有,如“猫生猫,鸭生鸭”、“龙生龙,风生凤,老鼠的儿子会打洞”等等(图1)。这些 “Fruit with melons and seeds with beans” is a proverb that has been formed by humans for a long time. The meaning of this idiom is: The melons can be obtained with similar traits, and beans can be obtained with similar traits. If watermelon is sown, watermelon can be harvested; if sowing broad beans, broad beans can be harvested. Such proverbs are also formed, such as “cats and cats, ducks and ducks,” “dragons and dragons, wind and phoenixes, the son of a mouse will make holes,” etc. (Figure 1). These ones