染色单体

At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.

此时每条染色体由对染色体构，这两条联合的染色体称为四分体。

At anaphase the dicentric chromatid will form a bridge and the acentric a fragment, both of which can be scored.

在后期双着绿点染色体将形桥，无着绿点染色体体形断片，此两记录下来。

Human Peripheral blood exposed with tritiated water at variousdoses for 54 hr was examined to observe the chromosome and chromatid abe-rrations at metaphases in the first mitosis of lymphocytes.

将人体外周血在不同剂量的氚水中培养54小时,观察到淋巴细胞第次有丝分裂中期的染色体型及体型畸变。