Farmers make bigger, meatier turkeys by crossing the biggest, meatiest turkeys in each generation to amplify the gene variants for bigness and meatiness...but this only works to a point.
农场主们通过将每一代最大的,肉最多的火鸡进行杂![](https://dict.eudic.net/tmp/wordimg/OG1ZdHhzXo2AkrDIO1ZnrtdrEnM=.png)
![](https://dict.eudic.net/tmp/wordimg/33jf7GStLh06Vkrjg1aJV3qGr6o=.png)
大体型和肉量上的基因变异,从而培育出更大,更多肉的火鸡......但这个方法的效果有限。