A gene knock-in (or knock-in) refers to a genetic engineering method that involves the one-for-one substitution of DNA sequence information in a genetic locus or the insertion of sequence information not found within the locus. A gene knock-in therefore can be seen as a gain of function mutation and a gene knockout a loss of function mutation, but a gene knock-in may also involve the substitution of a functional gene locus for a mutant phenotype that results in some loss of function.

31. Having an external locus of control is the key to staying motivated.

Locus轨迹指令可以产生动点的轨迹。

Locus轨迹指令需要一个轨迹点，一个控制点

GenBank数据库里面的字段包括? LOCUS|VERSION|ORIGIN|ACCESSION

中国大学MOOC: Locus轨迹指令可以产生动点的轨迹。

中国大学MOOC: Locus轨迹指令需要一个轨迹点，一个控制点

Locus轨迹指令可以产生动点的轨迹。 A: 正确 B: 错误

Locus轨迹指令需要一个轨迹点，一个控制点 A: 正确 B: 错误

在GeoGebra中，Locus轨迹指令可以产生动点的轨迹。