您说的是这个共线性或者同线性。
syntenic genes that are  located on the same chromosome because they are lost along with a marker gene that is known to be located on that chromosome.
我还以为您的汉语表述就是英语表述的有两个内容，您的第一个应该是synteny，第二个是syntenic genes。
所以我说表述不准确。开始我以为您要说synteny。

谢谢你的质疑，你的质疑让我们对这个术语理解得更全面了。
综合下面来看，在经典或传统遗传学中，共线性（synteny）指遗传位点或基因位于同一条染色体上的现象。而目前生物学家常用共线性（synteny）来指两套染色体内区块顺序的保守性或者指两个（亲缘关系相近的）物种之间保守的序列或基因顺序。
前者中，同线基因（syntenic genes）是指位于同一条染色体上的基因；而后者则用同基因集（syntenic gene sets）或同线（区）块（syntenic block）。

同基因集（syntenic gene sets）：
Syntenic gene sets are sets of genes located in syntenic regions (genomic regions derived from the same ancestral genomic region) within and across genomes. These genes are usually in a collinear gene order and are used as evidence that the regions are syntenic.
https://genomevolution.org/wiki/index.php/Syntenic_gene_sets

同线（区）块（syntenic block）：
Syntenic block: This term refers to a set of syntenic genomic regions and is usually comprised of syntenic gene sets. Syntenic blocks are of interest to researchers as a unit of evolutionary history that may be used for additional studies such as:
genome evolution
ancestral genome reconstruction
gene family evolution
origin of gene family duplicates
https://genomevolution.org/wiki/index.php/Synteny