双生

The micrib belonging to bicollateral bundle is well developed.The bundle sheath is composed of idioblasts.

主脉发达，有异细组成的维管束鞘，具双韧皮部。

Siblings and dizygotic twins share only 50% of their segregating genes.

同卵双双和双卵双双享仅50%的基因。

Methods 82 pairs of female -female twins between 6-12 years old were collected.Twin zygosity diagnosis were made by DNA-fingerprinting.

方法收集6-12岁女性双子82对，通过DNA指纹图进行卵型诊断。

This British grass snake exhibits dicephalus, a condition related to conjoined twinning. It is caused during development by high incubation temperatures.

这条英国草蛇示一种与连体双有关的疾，双头畸。这是在发育阶段由高温孵化造成的。

Geminiviruses are a group of plant viruses occurred worldwide and characterized by their unique twinned particles, which encapsidate a circular single-stranded DNA genome.

双是一类世界范围内广泛发的具有孪颗粒形态的植物单链DNA,近年来已在多种作物上造成毁灭性危害,给作物产造成了严重损失。