These cells had retained a diploid Karyotype.是什么意思？

These cells had retained a diploid Karyotype.

这些细胞持有二倍体核型.

these

adj. 这些的；pron. 这些；

例句
There's lots of money about these days for schemes like this.
近来这类计划资金充足。

cells

n. <生>细胞( cell的名词复数 )，小牢房，（修道士或修女住的）小房间，电池；

例句
An increasing body of evidence suggests that all of us have cancer cells in our bodies at times during our lives.
越来越多的证据表明，我们所有人一生中体内时有癌细胞存在。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

retained

v. 保持( retain的过去式和过去分词 )，拦住，保存，止住；

例句
She retained a number of copies for further annotation.
她保留了许多副本以便作进一步的注解。

diploid

adj. 双重的，倍数的，双倍的；n. 二倍体，倍数染色体；

例句
Comparatively , PCR - Acc molecular marker produced two genotypes , G - type and T - type for both autotetraploid and diploid rice.
而用PCR-Acc检测, Wx基因表现为G - 型和T - 型.

karyotype

n. 染色体组型，核型；

例句
The chromosome number and karyotype of Astragalus chinensis X.
本文首次报道了民和黄芪的染色体数目及核型.