产生异常分离的原因可能与配子体或孢子体的选择有关。
The main reasons of distorted segregation ratios are responsible for the selection of gametes or sporophytes.
凤尾蕨属植物孢子的形态稳定， 种间差异明显， 但孢子形态特征与孢子体的形态特征是不相关的。
The spore morphology of Pteris is stable, and the difference between species is distinct , but the features of spore and sporophyte are not related.
例如在雌雄异株物种中的雌性植物和雄性植物，气生的和被水浸没的叶片，生活史中的配子体与孢子体的交替，叶肉和维管束鞘叶绿体等。
Examples include male and female plants in dioecious species aerial and submerged leaves alternation of gametophyte and sporophyte stages of a life cycle and mesophyll and bundle-sheath chloroplasts.
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